.5 seconds is the time it takes to change lights on a sportsman tree. First amber lights, .5 seconds later the second amber lights, then .5 seconds later the third amber lights, then .5 seconds later the green lights. Reaction time is measured after the green lights not after the third amber lights. Similarly, it is .4 seconds on a pro style tree where all three ambers light at the same time and then it goes green.
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2015 Audi SQ5
2000 Alero GLS Coupe - still in the family, but I don't drive it anymore
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