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2. Automotive lighting - Wikipedia

   en.wikipedia.org/wiki/Automotive_lighting

   Light bar on a British police car. Emergency vehicles such as fire engines, ambulances, police cars, snow-removal vehicles and tow trucks are usually equipped with intense warning lights of particular colours. These may be motorised rotating beacons, xenon strobes, or arrays of LEDs.

3. Emergency vehicle lighting - Wikipedia

   en.wikipedia.org/wiki/Emergency_vehicle_lighting

   The police car on the right is a slicktop car, lacking the traditional roof-mounted lightbar seen on the car on the left. The aerodynamic properties of light bars can be important for police applications, as fuel efficiency and drag are concerns in patrol and pursuit. Because of this, some police cars do not have roof mounted lightbars.

4. Police car - Wikipedia

   en.wikipedia.org/wiki/Police_car

   A ghost car, also known as a stealth car or semi-marked car, is a police car that combines elements of both an unmarked car and a marked patrol car, featuring markings that are either similar colors to the vehicle's body paint, or are reflective graphics that are difficult to see unless illuminated by lights or viewed at certain angles. [19]

5. Courtesy lights - Wikipedia

   en.wikipedia.org/wiki/Courtesy_lights

   Police cars, fire trucks, ambulances or other emergency vehicles have sirens and red and blue or red and white or red lights. Private vehicles operated by volunteer fire and rescue squad members (with emergency vehicle identification) responding to an emergency call use blue lights. [4]

6. Mobile billboard - Wikipedia

   en.wikipedia.org/wiki/Mobile_billboard

   Most mobile billboards are dedicated, customized LED trucks with large bodies for displaying advertisements. Some of these dedicated units offer features such as external sound systems, illumination, LED panels and hot/cold boxes for product sampling, although they are illegal in many cities. Digital mobile billboard trucks have become popular ...

7. Jennifer Eberhardt on Oakland Police cutting its traffic ...

   www.aol.com/news/how-the-oakland-police-cut...

   Professor Jennifer Eberhardt discussed how a team of Stanford University researchers helped the Oakland Police Department dramatically reduce its traffic stop numbers on Yahoo Finance UK's 'Global ...