Six U.S. cities have been found guilty of shortening the amber cycles below what is allowed by law on intersections equipped with cameras meant to catch red-light runners. The local governments in question have ignored the safety benefit of increasing the yellow light time and decided to install red-light cameras, shorten the yellow light duration, and collect the profits instead.

The cities in question include Union City, CA, Dallas and Lubbock, TX, Nashville and Chattanooga, TN, Springfield, MO, according to Motorists.org, which collected information from reports from around the country. This isn't the first time traffic cameras have been questioned as to their effectiveness in preventing accidents. In one case, the local government was forced to issue refunds by more than $1 million to motorists who were issued tickets for running red lights.

The report goes on to note these are just instances that have been identified, and there may be more out there, and urges visitors to send in their own findings.