Grooves in the Road at Red Light Cam Intersections


Here in Albuquerque, NM, the city has started to cut grooves in the road at red light cam intersections. The series of grooves can be felt by the driver and are about 30 feet in front of the intersection. The city claims that this measure is to address people's concerns, but has not said which concerns these grooves address. Does anyone know why the city is cutting these grooves?



Being a person who does not trust government, I would cynically speculate that these grooves, in addition to make noise to alert the driver, also serve to increase stopping distances - that way one is more likely to slide into the interaction while under heavy braking, getting a ticket and knowing that you are getting it from the pavement noise.

But then I'm just being cynical.

___________________ Garmin 2455, 855, Oregon 550t

letting drivers know?

maybe to address the concern that drivers dont know that the red light cam is there (for those Non GPS enabled). 30ft seems to be a bit late however - seems like its a silly extra cost to justify the existance of the RLC....

the grooves will actualy

the grooves will actualy decrease stoping distance by creating more friction mostly in adverse weather

Red Light Markers

In Scottsdale, AZ the city has painted a thin red line about 5 ft into the intersection, perpendicular to the traffic lane. This red line shows in the camera photo and is a reference point.

Stopping Distance

I wonder if that will increase rear-end accidents since the grooves are only 5 feet in road length.

Grooves cut in road

Those grooves could be there for rain water drainage or act as rumble strips for drives to slow down entering an intersection.
Check out this link on rumble strips:

Grooves in the Road at Red Light Cam Intersections

The state law makers were annoyed at Albuquerque's red light camera system because it diverted money from the state to the city so (just to annoy Marty back) they passed a law that said Albuquerque had to install flashing lights or rumble strips. The rumble strips were cheaper.