SafetyQuestion 570 of 700
On a 55 mph roadway you must close a lane and shift traffic 12 feet. Using the merging taper formula L equals W times S for speeds of 45 mph and above (L in feet, W in feet, S in mph), what is the MINIMUM taper length?
a.660 feet
b.60 feet
c.132 feet
d.396 feet
Explanation
For posted speeds of 45 mph and above, the merging taper length L equals the offset width W times the speed S: L = 12 x 55 = 660 feet. Option b multiplies incorrectly. Option c and d use the wrong formula (the lower-speed version L = W x S squared / 60 applies only below 45 mph). Adequate taper length gives drivers enough distance to merge safely at higher speeds.
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