This Is What I've Always Wanted

FORT WORTH, Texas - (KRT) - The tag lines on various Web sites make them seem too good to be true.

"CHANGE STOPLIGHTS FROM RED TO GREEN IN SECONDS!"

"NOW YOU CONTROL THE INTERSECTIONS!"

The devices, mobile infrared transmitters, allow a person to change an upcoming traffic light from red to green from as far as 1,500 feet.

They are intended for emergency personnel, but sales of the devices to civilians on the Internet are making authorities nervous.

While the devices can cost more than $1,000 each from official dealers such as 3M, various Web sites sell knockoffs for less than $200.