CSLB C-21 Building Moving and Demolition (Trade Exam) — All Questions

An open basement on a demolished lot will be filled next month. What does the code require in the meantime?

• a.Provision to prevent water accumulation and damage to foundations nearby✓
• b.A perimeter fence, which is the protection the code asks for
• c.No action, since the lot will be filled within a month
• d.A warning sign at each corner, which is the protection the code asks for

Provision shall be made to prevent the accumulation of water or damage to foundations on the premises or on adjacent property. The requirement applies in the meantime. A fence does not manage water. A sign does not manage water.2025 CBC §3303.5

At what intervals must landings be provided for construction passenger elevators on a tall demolition?

• a.Not exceeding ten floors or one hundred feet of height
• b.Not exceeding eight floors or ninety-six feet of height
• c.Not exceeding five floors or sixty feet of height
• d.Not exceeding four floors or forty-eight feet✓

Landings are provided at intervals not to exceed four floors or forty-eight feet. Five floors is farther apart than the rule. Eight floors is farther apart than the rule. Ten floors is farther apart than the rule.Cal. Code Regs., tit. 8, §1735(r)(2)

What load must a canopy over an employee entrance be able to sustain?

• a.50 pounds per square foot
• b.100 pounds per square foot
• c.75 pounds per square foot
• d.150 pounds per square foot✓

Canopies must be capable of sustaining a load of 150 pounds per square foot. Fifty pounds per square foot is less than the rule requires. Seventy-five pounds per square foot is less than the rule requires. One hundred pounds per square foot is less than the rule requires.Cal. Code Regs., tit. 8, §1735(j)

Wood floor beams brace the interior walls of a building being demolished. What must be done before cutting them?

• a.Notify the building official in writing and wait for a reply
• b.Install other equivalent support to replace them✓
• c.Wet the beams down to reduce splintering during the cut
• d.Mark the beams with paint so that the crew can find them

Wood floor beams that brace walls shall be left in place until other equivalent support can be installed. Notification does not replace support. Wetting does not replace support. Marking does not replace support.Cal. Code Regs., tit. 8, §1735(f)(4)

Which floors must have exterior wall openings protected to a height of not less than 42 inches?

• a.The ground floor, where the public can reach the openings
• b.Floors above the sixth, with the lower floors left open
• c.All floors except the ground floor and the floor being demolished✓
• d.The floor that is currently being demolished by the crew

Exterior wall openings on all floors shall be protected to a height of not less than 42 inches, except on the ground floor and the floor being demolished. The floor being demolished is excepted. The rule covers floors from the second up, with no sixth-floor limit. The ground floor is excepted.Cal. Code Regs., tit. 8, §1735(k)

An employee feels overheated and wants a break. What does the heat illness rule say?

• a.The rest must be taken at the next scheduled break
• b.They are allowed and encouraged to rest in the shade✓
• c.The employee must first get a supervisor's written approval
• d.The rest is allowed once the employee has worked two hours

Employees shall be allowed and encouraged to take a preventative cool-down rest in the shade when they feel the need, and access is permitted at all times. The rest is not limited to scheduled breaks. No written approval is required. No hours-worked test applies; access is permitted at all times.Cal. Code Regs., tit. 8, §3395(d)(3)

What must employees have access to under the heat illness rule?

• a.Water at the main office, which is off the work area
• b.Water on request to the foreman, available at the foreman's discretion
• c.Bottled sports drinks, supplied by the employer
• d.Potable drinking water that is fresh, pure and suitably cool✓

Employees shall have access to potable drinking water that is fresh, pure and suitably cool. The rule requires potable water, not sports drinks. Access is not conditioned on asking the foreman. Water must be accessible at the work area.Cal. Code Regs., tit. 8, §3395(c)

Which situation must flagger training cover, along with signaling and one-way traffic control?

• a.Emergency vehicles traveling through the work zone✓
• b.Selecting concrete mix designs for the new foundation
• c.Reading architectural elevations to find the building height
• d.Calculating backfill compaction for the finished excavation

The training covers emergency vehicles traveling through the work zone, handling emergencies and hostile drivers, among other topics. Concrete mixes are not flagger training. Reading elevations is not flagger training. Compaction calculations are not flagger training.Cal. Code Regs., tit. 8, §1599(g)

Which tailgate meeting schedule meets Title 8's "at least every 10 working days" rule?

• a.Working days 1 and 25
• b.Working days 1, 8 and 15✓
• c.Working days 1, 11 and 22
• d.Working days 1, 12 and 24

Gaps of 7 working days are shorter than 10, so the schedule satisfies the rule. A gap of 11 working days is longer than 10. A gap of 24 working days is far longer than 10. Gaps of 10 and 11 working days include one that exceeds 10.Cal. Code Regs., tit. 8, §1509(e)

A pedestrian barrier has an opening for workers and materials. How must the opening be protected?

• a.By doors that are normally kept closed✓
• b.By leaving the opening unprotected during the day
• c.By a rope tied across the opening
• d.By a sign reading "Authorized personnel"

Openings in barriers shall be protected by doors that are normally kept closed. A rope is not a door. A sign alone is not a door. The opening is protected at all times.2025 CBC §3306.5

Which helmet class does Title 8 require where there is a risk of contact with conductors greater than 600 volts?

• a.Class E or G
• b.Class G
• c.Class C
• d.Class E✓

Where there is a risk of head injury from contact with conductors greater than 600 volts, protective helmets shall be Class E. Class C is for no risk of contact with conductors. Class G is for conductors under 600 volts. Class E or G is for under 600 volts.Cal. Code Regs., tit. 8, §3381(c)(2)(C)

Within what distance of a building under construction must the ground area be reasonably free from irregularities when practicable?

• a.10 feet
• b.100 feet
• c.6 feet✓
• d.20 feet

The ground area within 6 feet of a building shall be reasonably free from irregularities where practicable. Ten feet is longer than the rule. Twenty feet is longer than the rule. One hundred feet is far longer than the rule.Cal. Code Regs., tit. 8, §1513(b)

What minimum illumination does the table give for outdoor active construction areas, excavation and waste areas and accessways?

• a.3 foot-candles
• b.5 foot-candles✓
• c.1 foot-candle
• d.2 foot-candles

The table gives 5 foot-candles for outdoor active construction areas, excavation and waste areas, accessways and similar locations. One foot-candle is below the table value. Two foot-candles is below the table value. Three foot-candles is for low-activity general areas.Cal. Code Regs., tit. 8, §1523

Sealed containers of hazardous chemicals arrive at the job site with safety data sheets. What must the employer do with them?

• a.Keep them in the main office, away from the site
• b.Maintain copies of the safety data sheets✓
• c.Discard them after unloading, once the labels are checked
• d.Send them back to the supplier with the empty containers

Employers shall maintain copies of safety data sheets received with incoming shipments of sealed containers of hazardous chemicals. Discarding them breaks the rule. Sending them back defeats the purpose. The standard calls for them to be maintained and accessible to employees.Cal. Code Regs., tit. 8, §5194(g)

What size lumber must wood top railings be, at a minimum?

• a.Rough 1-inch by 6-inch boards laid flat on posts
• b.Smooth 2-inch by 4-inch or larger material✓
• c.A smaller size of lumber if it is nailed securely to the posts
• d.Smooth 1-inch by 2-inch material fastened with screws

Wood top railings shall be smooth and of 2-inch by 4-inch or larger material. A 1 by 2 is smaller than the minimum. A 1 by 6 is not the stated size, and it must be smooth. Size is specified, whatever the nailing.Cal. Code Regs., tit. 8, §1620(b)(3)

When must employers train employees on hazardous chemicals in their work area?

• a.After the first accident involving chemicals
• b.At the time of the employee's initial assignment✓
• c.If the employee asks the supervisor for it
• d.Once each year on the anniversary of hire

Employers provide effective information and training on hazardous chemicals at the time of initial assignment. Training is not delayed until an accident. Training is due at assignment, with additional training when new hazards are introduced. The employee's request is not required.Cal. Code Regs., tit. 8, §5194(h)

What minimum illumination does the table give for general construction area lighting at low activity?

• a.5 foot-candles
• b.10 foot-candles
• c.3 foot-candles✓
• d.30 foot-candles

The table gives 3 foot-candles for general construction area lighting of low activity. Five foot-candles is the figure for outdoor active areas and indoor stairways. Ten foot-candles is for plants and shops. Thirty foot-candles is for other operations.Cal. Code Regs., tit. 8, §1523

Which helmet classes may be used where helmets are only needed against flying or falling objects, with no risk of contact with conductors?

• a.Class E or G, since a conductor-rated helmet is required on every site
• b.Class C, E or G✓
• c.None of the classes
• d.Class C, because Classes E and G are reserved for conductor work

With no risk of head injury from conductors, helmets shall be Class C, E or G. Classes E and G are also permitted; the rule lists C, E or G. Where there is no conductor risk, Class C is allowed too. Some class applies; helmets are required.Cal. Code Regs., tit. 8, §3381(c)(2)(A)

In the respiratory protection standard, what is a qualitative fit test?

• a.A pass or fail test that relies on the individual's response to a test agent✓
• b.A test that measures leakage numerically with an instrument
• c.A check of the respirator's filter by the supplier on delivery
• d.A medical test of the wearer's lung capacity before fitting

A qualitative fit test is a pass/fail assessment that relies on the individual's response to the test agent. Numerical leakage measurement describes a quantitative test. A lung test is a medical evaluation. A supplier filter check is not a fit test.Cal. Code Regs., tit. 8, §5144(b)

In the respiratory protection standard, what is a quantitative fit test?

• a.A test of the wearer's ability to climb stairs wearing the mask
• b.An assessment that numerically measures the amount of leakage into the respirator✓
• c.A review of the manufacturer's data sheet for the respirator
• d.A pass or fail test based on the wearer's response to a scent

A quantitative fit test measures the amount of leakage into the respirator numerically. Response-based pass/fail testing describes a qualitative test. Stair climbing is not a fit test. A data sheet review is not a fit test.Cal. Code Regs., tit. 8, §5144(b)

Which hazards must hand protection address?

• a.Impact injuries to the knuckles and fingers from falling debris
• b.Electric shock, which is the single hazard the standard names
• c.Chemical splashes, since cuts are handled through training alone
• d.Cuts, abrasions, punctures, chemical burns, thermal burns and harmful temperature extremes✓

Employers provide hand protection against hazards such as skin absorption, cuts, abrasions, punctures, chemical and thermal burns and temperature extremes. Impact injuries are not the stated list, which covers cuts, burns and temperature extremes. Chemical burns are on the list, but so are cuts, abrasions and punctures. Electric shock is not the single hazard named.Cal. Code Regs., tit. 8, §3384(a)

How may the employer give employees the results of asbestos monitoring?

• a.By word of mouth at the next tailgate meeting, with a note in the log
• b.In writing, either individually or by posting at a centrally located place accessible to affected employees✓
• c.By e-mail to the owner, since the owner holds the contract
• d.By posting at the main office, which is off the work site

Notification is in writing either individually or by posting at a centrally located place accessible to affected employees. A spoken report is not written notice. The owner is not the notified party. The posting must be accessible to affected employees.Cal. Code Regs., tit. 8, §1529(f)(5)

When may white outer garments with qualifying retroreflective material replace colored vests at night?

• a.During snow or fog
• b.Except during snow or fog✓
• c.When a flagger is on duty
• d.When the worker is not exposed to vehicle traffic

White outer garments with qualifying retroreflective material may be worn in darkness but not during snow or fog. Snow and fog are the exceptions to the permission. The permission is not tied to a flagger. The permission is about snow and fog conditions, not about exposure to traffic.Cal. Code Regs., tit. 8, §1598(d)

How must protective equipment be marked?

• a.With the name of the employee to whom it was issued
• b.With the date of the hazard assessment, written on a label
• c.Distinctly, so as to facilitate identification of the manufacturer✓
• d.With the employer's company name, applied by the employer

Protective equipment shall be distinctly marked so as to facilitate identification of the manufacturer. The identification is of the manufacturer, not the employer. Assessment dates go in the certification. Employee names are not the marking.Cal. Code Regs., tit. 8, §3380(b)

What must the employer ensure about the fit of PPE?

• a.It fits the supervisor, who approves the purchase of it
• b.It is one size that is supposed to fit the employees
• c.It properly fits each affected employee✓
• d.It fits an employee of average size and build

The employer shall select PPE that properly fits each affected employee. Average size is not the standard. One size for all does not ensure fit. The supervisor is not the measure.Cal. Code Regs., tit. 8, §3380(f)(1)(C)

Who must train flaggers?

• a.The building official, who issues the street-use permit
• b.The traffic engineer of the city where the work is located
• c.An employee who is available on the day the flagger is needed
• d.Persons with the qualifications and experience to instruct effectively✓

Flaggers shall be trained by persons with the qualifications and experience necessary to effectively instruct. Availability is not qualification. The building official is not required to train flaggers. The rule does not require a city traffic engineer.Cal. Code Regs., tit. 8, §1599(h)

When must jobsite vehicles have brake lights in operable condition?

• a.Regardless of light conditions✓
• b.At night, when the light is poor
• c.When carrying passengers in the cab
• d.On public roads and not on a job site

All vehicles shall have brake lights in operable condition regardless of light conditions. Daytime is included. The rule applies on jobsites. The rule is not limited to carrying passengers.Cal. Code Regs., tit. 8, §1597(c)

How must documentation of flagger training be kept?

• a.As required by the Injury and Illness Prevention Program section✓
• b.By the building official, in the permit file for the site
• c.On the flagger's vest, as a card clipped to the front
• d.In a log kept by the flagger and discarded after the job

Documentation of the training shall be maintained as required by Section 3203, the Injury and Illness Prevention Program. Documentation must be kept as the Injury and Illness Prevention Program requires, not discarded. The vest is not a record. The employer maintains the record.Cal. Code Regs., tit. 8, §1599(g)

How does the employer select the proper class of high-visibility safety apparel for an activity?

• a.By consulting the Manual, the apparel manufacturer, the ANSI/ISEA standard's appendix or ATSSA✓
• b.By letting each worker pick a color and style that he or she prefers
• c.By choosing the least costly garment sold at the local supply store
• d.By asking the building official to choose a class for the whole crew

The employer selects the proper class by consulting the Manual, the manufacturer, ANSI/ISEA 107 Appendix B or ATSSA. Price is not the selection basis. Worker preference is not the basis. The building official does not select the garment class.Cal. Code Regs., tit. 8, §1598(e)

To which standard must a flagger's warning garment be manufactured?

• a.ANSI Z89.1, American National Standard for Industrial Head Protection
• b.ASTM F2413, Standard Specification for Performance of Foot Protection
• c.ASTM D1557, the laboratory method for soil compaction tests
• d.ANSI/ISEA 107, High Visibility Safety Apparel and Headwear✓

Flaggers wear warning garments manufactured in accordance with ANSI/ISEA 107, High Visibility Safety Apparel and Headwear. Z89.1 is the head protection standard. F2413 is the foot protection standard. D1557 is a soil test method.Cal. Code Regs., tit. 8, §1599(d)

Whenever visibility conditions warrant additional light, what lights must jobsite vehicles have in operable condition?

• a.Hazard flashers, mounted at the rear of the vehicle
• b.One headlight and one taillight on each vehicle in use
• c.At least two headlights and two taillights✓
• d.Two headlights, since taillights are optional on a site

Vehicles in use shall be equipped with at least two headlights and two taillights in operable condition. One of each is fewer than the rule requires. Taillights are required as well. Hazard flashers are not substitutes.Cal. Code Regs., tit. 8, §1597(b)

Which lead exposure triggers the employer's duty to provide shower facilities?

• a.Exposure at or above the action level on 30 or more days a year
• b.Exposure above the 10 microgram permissible exposure limit
• c.Exposure above the action level of 2 micrograms per cubic meter
• d.Airborne exposure above 50 micrograms per cubic meter, or interim protection for Level 3 trigger tasks✓

Showers are provided for employees whose airborne exposure is above 50 micrograms per cubic meter and as interim protection for Level 3 trigger tasks. Showers are not required at the action level alone. Ten micrograms is the PEL, not the shower threshold. Thirty days is a medical surveillance idea, not the shower trigger.Cal. Code Regs., tit. 8, §1532.1(i)

Which material may not be used as a top rail or mid-rail?

• a.Wire rope drawn tight between posts
• b.Steel banding or plastic banding✓
• c.Wood boards of the stated size, nailed securely
• d.Steel pipe set in sockets in the floor

Steel banding and plastic banding shall not be used as top rails or mid-rails. Wood top railings are permitted in the stated sizes. Wire rope is not the banned material named in the rule. Pipe is not the banned material named in the rule.Cal. Code Regs., tit. 8, §1620(h)

What must the employer promptly notify an employee of after each occasion that an initial lead medical examination or consultation is done?

• a.The amount of the employer's insurance premium
• b.The employee's expected retirement benefits
• c.The right to refuse further work
• d.The right to seek a second medical opinion✓

The employer shall promptly notify the employee of the right to seek a second medical opinion after each initial examination or consultation. The rule gives no right to refuse work. Premiums are not part of the notice. Benefits are not part of the notice.Cal. Code Regs., tit. 8, §1532.1(j)

Which worker exposure requires personal fall protection when no other protection is provided?

• a.A worker at an unprotected leading edge 9 feet above the next level✓
• b.A worker on a stepladder 5 feet above the floor of the room
• c.A worker on a scaffold plank 3 feet above the floor level
• d.A worker standing on a concrete slab at ground level

Personal fall protection is required where work exposes employees to a fall of more than 7-1/2 feet from edges, openings and similar locations. Three feet is below the 7-1/2 foot trigger. Five feet is below the 7-1/2 foot trigger. Ground level has no fall exposure.Cal. Code Regs., tit. 8, §1670(a)

Which document sets the specifications for the size and design of traffic control signs, lights and devices?

• a.The recycling plan filed with the building department
• b.The Injury and Illness Prevention Program of the employer
• c.The employer's Code of Safe Practices posted at the office
• d.The California Manual on Uniform Traffic Control Devices✓

Specifications for size and design of signs, lights and devices are as described in the Manual. The IIPP is the safety program and not a sign specification. The Code of Safe Practices does not specify signs. The recycling plan has nothing to do with signs.Cal. Code Regs., tit. 8, §1598(b)

A flagger works after dark. What must be true of the flagger's station?

• a.The station is moved at least 100 feet back from the work area
• b.The station is left unlit, to avoid glare for approaching drivers
• c.The station is lit so the flagger is clearly visible to traffic✓
• d.The station is marked with a single reflective cone at the curb

During hours of darkness, flaggers' stations shall be illuminated so the flagger will be clearly visible to approaching traffic. A single cone does not illuminate the station. Distance is not the requirement. Lighting is required, not avoided.Cal. Code Regs., tit. 8, §1599(e)

After the employer selects PPE, what must it do about the selection?

• a.Post it at the main office, away from the work site
• b.Hold the decision until the PPE has arrived at the site
• c.Communicate the selection decision to each affected employee✓
• d.Keep the decision confidential until the next audit by the agency

The employer shall communicate selection decisions to each affected employee. Selection decisions are communicated. Communication is not deferred. Employees are told, not only the office.Cal. Code Regs., tit. 8, §3380(f)(1)(B)

A worker must guide wire rope by hand onto a power-driven drum when no mechanical threading device can be used. What does Title 8 require?

• a.The hands stay within 6 inches of the drum to keep control of the rope
• b.The worker wears loose gloves for a better grip on the rope
• c.The worker may use a foot to hold the rope in place on the drum
• d.Feet are not used, and the hands stay at least 3 feet from the drum✓

When the rope must be guided manually, the feet shall not be used and the hands shall be kept at least 3 feet from the drum. Hands near the drum can be drawn in. Feet are not to be used. Loose gloves can be caught in the drum.Cal. Code Regs., tit. 8, §1593(c)

What does a Type I helmet protect against?

• a.Electrical contact up to 20,000 volts
• b.Flying particles to the eyes
• c.A blow to the top or sides of the head
• d.A blow only to the top of the head✓

Type I helmets are intended to reduce the force of a blow only to the top of the head. That describes Type II. Electrical protection is a class, not a type. Eye protection is a separate item.Cal. Code Regs., tit. 8, §3381(c)(1)

What must each approved protective helmet bear?

• a.A sticker with the employee's name and the date it was issued
• b.A paint color matching the company's other safety equipment on site
• c.A tag with the purchase date and the supplier's street address
• d.Permanent markings that identify the manufacturer, ANSI standard and date, and class and impact type✓

The helmet shall bear permanent markings identifying at least the manufacturer, ANSI standard number and date, and class and impact type. A name sticker is not the required marking. Paint color is not a marking. A purchase tag is not enough.Cal. Code Regs., tit. 8, §3381(d)

At what exposure must the employer make lead medical examinations and consultations available?

• a.For supervisors, since crews are covered by the company plan
• b.At exposures above 500 micrograms per cubic meter, with no examinations below that level
• c.After a worker reports symptoms of lead poisoning to the foreman
• d.At or above the action level, and as interim protection for trigger task employees✓

The standard requires medical examinations and consultations for employees exposed at or above the action level and, as interim protection, those performing trigger tasks. The action level is far below 500. Symptoms are not the trigger. The rule covers exposed employees, not only supervisors.Cal. Code Regs., tit. 8, §1532.1(j)

Which of these does the respiratory protection standard require for employees who must use respirators?

• a.A haircut or shave on the first day
• b.A signed statement from the supplier
• c.Medical evaluations before use✓
• d.A written promise to avoid dust

The program includes medical evaluations of employees required to use respirators. A promise is not a program element. A supplier statement is not a program element. The standard does not require a haircut.Cal. Code Regs., tit. 8, §5144

What does Title 8 say about body belts in personal fall arrest systems?

• a.They are required in fall arrest systems, with a lanyard
• b.They are allowed for a fall of less than 10 feet in height
• c.They are acceptable if the lanyard is rated at 5,000 pounds or more
• d.They may not be used in fall arrest, with limited exceptions✓

Effective January 1, 1998, except as permitted in the stated subsections, body belts shall not be used as part of a personal fall arrest system. Body belts are not required; harnesses are used. The rule has no 10-foot allowance. The lanyard rating does not change the belt rule.Cal. Code Regs., tit. 8, §1670(b)

In what way must employees use protective equipment?

• a.In the way that the most senior worker prefers
• b.When a supervisor is watching the work at the time
• c.In the way that is fastest on the day of the task
• d.In accordance with the manufacturer's instructions✓

The employer shall assure the employee is instructed in, and uses, protective equipment in accordance with the manufacturer's instructions. Speed is not the standard. Seniority is not the standard. Use is not conditional on supervision.Cal. Code Regs., tit. 8, §3380(c)

How must a pilot car stay in contact with the escorted load?

• a.By two-way radio communication✓
• b.By a flag on the front bumper
• c.By cell phone texting
• d.By hand signals from the rear window

Pilot cars shall maintain communications with the escorted load via two-way radio communication device. Hand signals are not reliable communication over distance. Texting while driving is not the stated device. A flag does not communicate.Caltrans Transportation Permits Manual, ch. 5 §502.6

When is eye or face protection required?

• a.Where there is a risk of eye injury from flying particles, hazardous substances, projections or injurious light rays✓
• b.On projects with more than ten workers on the payroll
• c.When a worker is welding, since light is the single eye hazard
• d.When the worker asks for it, and the foreman agrees in writing

Eye or face protection is required where there is a risk of eye injury from flying particles, hazardous substances, projections or injurious light rays. The rule covers more than welding. Workers need not ask. The rule has no headcount test.Cal. Code Regs., tit. 8, §3382(a)

A top rail measures 44 inches above the floor. Does it meet Title 8's height requirement?

• a.No, because it must be exactly 42 inches
• b.Yes, because it is between 42 and 45 inches✓
• c.No, because it must be at least 48 inches
• d.Yes, because a height over 36 inches is acceptable

The top rail must be not less than 42 inches or more than 45 inches. The rule gives a range, not an exact value. Forty-eight inches is above the range. Thirty-six inches is below the range.Cal. Code Regs., tit. 8, §1620

What may employees not do inside an asbestos regulated area?

• a.Use a wet-method sprayer to keep the material damp
• b.Wear coveralls and head covering supplied by the employer on site
• c.Take a cool-down rest in the shade during hot weather
• d.Eat, drink, smoke, chew tobacco or gum, or apply cosmetics✓

The employer shall ensure employees do not eat, drink, smoke, chew tobacco or gum, or apply cosmetics in the regulated area. Coveralls are required protection, not prohibited. Wet methods are part of the controls. A cool-down rest is taken outside the regulated area.Cal. Code Regs., tit. 8, §1529(e)(5)

Where are flaggers placed in relation to the equipment or operation?

• a.As near to the work as possible
• b.So as to give effective warning✓
• c.Behind the equipment, out of traffic
• d.At the site entrance throughout the day

Flaggers shall be placed in relation to the equipment or operation so as to give effective warning. The rule gives no fixed entrance location. Behind the equipment does not warn approaching traffic. Nearness alone is not the test.Cal. Code Regs., tit. 8, §1599(b)