Regulatory signs
Do Not Enter sign
You may not drive past this sign. It marks an entrance you are not allowed to use.
- Square
- White
- MUTCD R5-1
Shape and background first
Federal designation R5-1 in the MUTCD, the national standard every state signs to.
What the MUTCD specifies
Designation: R5-1
MUTCD Section 2B.46
Conventional road size: 30 x 30 in
Standard: Install this sign at specified wrong-way entries, including where a two-way road becomes one-way.
Source: Federal Highway Administration, MUTCD 11th Edition (December 2023), Part 2, Table 2B-1; Section 2B.46, verified 2026-09-26.
What the test wants you to know
The mistake people make
This one is usually posted at exit ramps and one way street entrances, paired with a Wrong Way sign further in. If you see it while driving, you have already made a mistake and should stop before entering.
The sign people confuse it with
Do Not Enter gets mixed up with Wrong Way more than any other pairing in this category. Put them side by side and the difference is obvious, which is exactly why it is worth doing once rather than meeting them cold in the exam.
Do Not Enter
You may not drive past this sign.
Wrong Way
You are traveling against the flow of traffic.
