TRAFFIC INNOVATIONS
PROS AND CONS

PHOTO	INNOVATION	DESCRIPTION	ADVANTAGES	DISADVANTAGES
	Lower speed limits for trucks	Trucks must go slower than cars	Less severe crashes	More passing conflicts Many trucks slow all traffic
	Speed hump	Slows traffic down	Makes vehicles go slower	Hurts people with bad backs Damages some vehicles Can high-center long vehicles
	Michigan Left diverted turns	Diverts left turns away from the main intersection using U turns	Reduces congestion Fewer signal phases	Confuses some drivers
	Leading pedestrian interval	Gives pedestrians time before releasing motor vehicles by showing walk with red	Gives pedestrian time to start	Drivers who stretch the yellow light into the red clearance will violate this Reduces intersection capacity
	Pedestrian hybrid beacon	Stops traffic to let pedestrians cross with flashing yellow, steady yellow, steady red, and flashing red	Gives pedestrians time to cross Pedestrian gets walk on steady red	Uses too much vehicle time with only one pedestrian Pedestrian often crosses too early during flashing yellow
	Rapid flashing rectangular beacon	Blinks to warn of pedestrian crossing	Does not use too much vehicle time	No positive protection for pedestrians
	Diverging diamond interchange	Traffic moves to left side of road to minimize left turn conflicts Traffic signals at points where lanes cross over	Reduces congestion Left turns do not cross other traffic	Some drivers afraid to drive on left Reduces cross street straight-ahead capacity
	Flashing yellow arrows	Provide a permissive turn phase without using a circular green	Allows permissive turns where a circular green can't be shown Prevents the yellow-trap hazard.	Some drivers don't understand it
	Roundabout	Provides a nearly continuous flow of traffic Entering traffic yields to traffic already on the circle	Traffic usually doesn't have to stop Reduces accidents	Some drivers don't understand it Traffic signals can overload them