Editing Traffic light (section)

=== Yellow trap ===
Without an all-red phase, cross-turning traffic may be caught in a [[yellow trap]]. When the signal turns yellow, a turning driver may assume oncoming traffic will stop and a crash may result. For this reason, the US bans sequences that may cause a yellow trap.<ref>{{Cite web |title=Frequently Asked Questions – Part 4 Highway Traffic Signals – FHWA MUTCD |url=https://mutcd.fhwa.dot.gov/knowledge/faqs/faq_part4.htm#tcsfq3 |access-date=18 December 2021 |website=[[Federal Highway Administration|Federal Highway Administration (FHWA)]]}}</ref>  This can also happen when emergency vehicles or railroads preempt normal signal operation.
<ref>{{cite web |date=7 January 2015 |title=The Flashing Yellow Arrow and the Yellow Trap |url=https://streets.mn/2015/01/07/the-flashing-yellow-arrow-and-the-yellow-trap/ |access-date=3 April 2019}}</ref> In the United States, signs reading "Oncoming traffic has extended green" or "Oncoming traffic may have extended green" must be posted at intersections where the "yellow trap" condition exists.<ref>{{cite web |title=FHWA&nbsp;– MUTCD&nbsp;– 2003 Edition Revision 1 Chapter 4D |url=https://mutcd.fhwa.dot.gov/htm/2003r1r2/part4/part4d.htm#section4D05 |access-date=19 May 2009 |publisher=[[Federal Highway Administration|Federal Highway Administration (FHWA)]]}}</ref><ref>{{cite web |title=FHWA&nbsp;– MUTCD&nbsp;– 2003 Edition Revision 1 Chapter 2C |url=https://mutcd.fhwa.dot.gov/htm/2003r1r2/part2/part2c.htm#section2C39 |access-date=19 May 2009 |publisher=[[Federal Highway Administration|Federal Highway Administration (FHWA)]]}}</ref>