¥"The percentages of these vehicles, that is of vehicles that could have been involved in a conflict with cross-street traffic,
were substantially smaller at both sites and under
all conditions after the yellow duration was extended. No evidence was found at either site, under any of the
conditions, that the vehicles
that were in potential conflict with cross-street traffic with the extended yellow would have cleared
the intersection earlier in the cycle
if the yellow had not been extendedÉÓ
¥
¥ÒThus, the
extensions of yellow duration employed in this study substantially reduced the frequency of potential intersection conflicts."