Road markings explained
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U.S. Traffic Law Guide
Clear, statute-verified answers to road markings and driving rules
Key pages last verified: 2025-09-29 · Sources: MUTCD, State Statutes
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Right-on-red, turning & yielding
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Right on red by state →U-turn legality & exceptions
When a U-turn across a double yellow is legal, signage limits, and safe execution.
U-turn across double yellow →Browse by Category
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Quick Answers (FAQ)
When can I legally cross double yellow lines?
You can legally cross double yellow lines to make left turns into driveways, parking lots, or side streets in most states. However, passing other vehicles across double yellow lines is prohibited. Learn more →
When do school zone speed limits apply?
School zone speed limits apply when children are present or during posted hours. Speed limits drop to 15-25 mph with doubled fines for violations. Details →
Where is right turn on red prohibited?
Right turn on red is prohibited throughout New York City unless specifically allowed by signs. Areas with heavy pedestrian traffic commonly restrict it. State rules →
Can I use my cell phone while driving?
Most states prohibit handheld cell phone use while driving. Hands-free devices generally allowed for adults. Texting while driving banned in most states for all drivers. More info →
Who has the right of way at four-way stops?
At four-way stops, vehicle arriving first has right of way. If simultaneous, vehicle on right has priority. Straight or right turns have priority over left turns. Read guide →
How far from a fire hydrant can I park?
Most states require parking at least 15 feet from fire hydrants. Some jurisdictions require 20 feet. Violations result in fines and possible towing. Parking rules →
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