Permissive yellow rule:
- Driver can legally enter intersection during entire yellow interval
- Violation occurs if driver enters intersection after onset of red
Restrictive yellow rule:
- Driver can neither enter nor be in intersection on red
- Violation occurs if driver has not cleared intersection after onset of red
Question: What is red-light Running?
Answer: Depends on the definition of what a yellow light means.
The permissive yellow rule is that stated in the MUTCD and Uniform Vehicle Code (UVC).
37 states + DC have laws in substantial conformity with the meaning of the yellow and red indications in the MUTCD and UVC. Another 9 states require motorists to stop on yellow but also drive cautiously through the intersection on the red if too close to stop safely.
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Four states—LA, TN, RI, WV—prohibit vehicles from crossing the intersection on red. The laws in these four states are not in conformity with the meaning of the yellow and red indications specified in the MUTCD.