Regulatory Road Signs: The Top 25 Must-Know Signs for the DMV Exam

What Defines a Regulatory Road Sign? The Color & Shape Code

Under FHWA MUTCD Chapter 2B, road signs are strictly categorized into three families: Regulatory Signs, Warning Signs, and Guide / Informational Signs.

Regulatory signs are the foundation of traffic law enforcement. They do not suggest or advise; they issue legally binding orders. They are identified by distinct shapes and colors:

• Red and White Signs: Signal absolute prohibition, mandatory stopping, or immediate exclusion (e.g., STOP, YIELD, DO NOT ENTER, WRONG WAY).
• Black and White Signs (Vertical Rectangles): Signal mandatory rules of movement, lane configurations, and numerical limits (e.g., SPEED LIMIT, ONE WAY, KEEP RIGHT).

Group 1: Red & White Priority & Exclusion Signs

These signs govern intersection priority and prevent catastrophic head-on freeway collisions:

• STOP (R1-1, Octagon): You must come to a complete, full stop behind the limit line or crosswalk under 4-way stop right-of-way rules. Rolling stops are an instant test fail.
• YIELD (R1-2, Inverted Equilateral Triangle): You must slow down and give right-of-way to all cross traffic and pedestrians, stopping if necessary.
• DO NOT ENTER (R5-1, Square with Red Circle & White Bar): Installed at freeway off-ramps and one-way streets. Crossing this sign means you are entering opposing high-speed traffic.
• WRONG WAY (R5-1a, Red Horizontal Rectangle): Paired just past DO NOT ENTER signs. If you see this sign, you are driving against oncoming traffic; brake immediately, pull to the shoulder, and turn around when safe.
• NO RIGHT TURN ON RED (R10-11a): Overrides standard right turn on red laws; you must remain stopped until the green signal appears.

Group 2: Black & White Lane & Movement Control Signs

These rectangular regulatory signs govern allowable vehicle movements:

• ONE WAY (R6-1 / R6-2): Traffic moves exclusively in the direction of the arrow. All lanes flow in that direction.
• NO U-TURN (R3-4, U-Turn Arrow with Red Prohibition Slash): U-turns are strictly illegal at this intersection or roadway section.
• NO LEFT TURN (R3-2) & NO RIGHT TURN (R3-1): Prohibits turning in the indicated direction (often due to one-way cross streets or heavy pedestrian volumes).
• LANE USE CONTROL SIGNS (R3-5, R3-8): Mandatory arrows indicating that specific lanes MUST turn left, MUST turn right, or may proceed straight.
• KEEP RIGHT (R4-7, Arrow curving around median island): Traffic must pass to the right of an oncoming median, divider, or traffic island.

Group 3: Speed, Passing & Parking Regulatory Signs

• SPEED LIMIT (R2-1): Establishes the maximum lawful speed on dry pavement under absolute and prima facie speed laws.
• MINIMUM SPEED LIMIT (R2-4): Prohibits driving slower than the posted speed (e.g., 40 MPH on freeways) to prevent impeding traffic flow.
• DO NOT PASS (R4-1): Prohibits overtaking across the centerline (reinforces solid yellow line markings).
• PASS WITH CARE (R4-2): Marks the end of a no-passing zone; passing is permitted when oncoming road is clear.
• SLOWER TRAFFIC KEEP RIGHT (R4-3): Mandates that vehicles moving slower than normal traffic flow must stay in the far-right lane.

The Top 5 "Trick" Regulatory Signs on the DMV Written Exam

DMV examiners know that applicants confuse subtle variations:

• DO NOT ENTER vs. WRONG WAY: "Do Not Enter" is placed at the entrance threshold; "Wrong Way" is posted further down the ramp as a secondary warning.
• NO TURN ON RED vs. RED ARROW: A red arrow prohibits turning on red automatically without needing a separate sign.
• DIVIDED HIGHWAY BEGINS vs. DIVIDED HIGHWAY ENDS: Look at the position of the median divider symbol: if the divider is at the top, the divided highway begins; if the divider is at the bottom, the divided road is ending.

Complete Top 25 Regulatory Road Signs Quick Reference

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