Ford Motor, one of the nation's top sellers of police vehicles, has come up with a way to make it harder for speeders to realize there is a cop on their tail.

Ford is offering to conceal the emergency lights that normally go on the roof of its Police Interceptor SUV — a rebranded Ford Explorer — inside the SUV's interior, right behind the windshield. That way, it will be harder for a driver to tell they are being tailed when they look in the rearview mirror.

“Today, agencies typically use aftermarket interior visor light bars that are somewhat bulky and can obstruct the field of vision — especially for taller officers,” said Stephen Tyler, Ford police marketing manager, in a statement. “This extremely low-profile unit is fully integrated where the headliner and top of the windshield meet, for tremendously improved driver visibility vs. aftermarket alternatives.”

It fits inside, just under the SUV's roof.

Besides the blue or red emergency lights, it can also shine a spotlight forward like a conventional light bar.

Ford dominated the police market for years with its Crown Victoria police cars, many of which are still in service. They were replaced by a modified Taurus sedan and Explorer SUV. The Explorer SUV has become the surprise hit. In California, it is a favorite for major police agencies, including the California Highway Patrol and Los Angeles Police Department.