Idaho Permit Test (ITD Knowledge Test) — All Questions

In Idaho, a driver 21 or older is legally impaired (DUI) at a blood alcohol concentration of:

• a.0.05 percent
• b.0.08 percent✓
• c.0.10 percent
• d.0.12 percent

The adult legal limit is 0.08 percent BAC; you can still be charged below that if impaired. (Idaho Driver's Manual, impaired driving)

For drivers under 21, Idaho's alcohol limit is:

• a.The same 0.08 as adults
• b.0.05 percent
• c.0.02 percent (zero tolerance)✓
• d.No limit with a parent present

Idaho applies a 0.02 percent BAC zero-tolerance limit to drivers under 21. (Idaho Driver's Manual, underage drinking and driving)

In Idaho, the minimum age to obtain a Supervised Instruction Permit (SIP) is:

• a.14 and a half (14 1/2) years old✓
• b.15 years old
• c.16 years old
• d.17 years old

Idaho allows a Supervised Instruction Permit at 14 1/2 years of age, earlier than most states. (Idaho Driver's Manual, graduated licensing)

Under Idaho's graduated licensing, a driver under 16 may generally:

• a.Drive any time with no restrictions
• b.Carry unlimited passengers
• c.Drive alone at night immediately
• d.Drive only during daylight unless accompanied by a licensed adult 21 or older✓

Drivers under 16 may drive only in daylight unless a licensed adult 21 or older is in the front seat, and passengers under 17 are limited in the first months. (Idaho Driver's Manual, graduated licensing)