Grooves in the Road at Red Light Cam Intersections

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.

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 decrease stoping distance by creating more friction mostly in adverse weather

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.

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

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:
http://safety.fhwa.dot.gov/roadway_dept/rumble/index.htm

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.

See http://www.thenewspaper.com/news/16/1658.asp