Lisbon is connected by rail and road to the interior of Portugal and to the rest of Europe. The 1.5-mile- (2.4-km-) long 25th of April Bridge, one of the longest suspension bridges in western Europe, has served as the main roadway into the city since it was built in the mid-1960s.
NHTSA estimates that 73% of light vehicles already voluntarily will have rear-view cameras by the final deadline of 2018 and that the cost per vehicle to equip the remainder will be $132 to $142 for a complete system, $43 to $45 to add the camera to a vehicle that already has an adequate display screen.
One aftermarket system is the QuickVu, a $259 system with a rearview camera that mounts to the license plate holder and uses radio signals to transmit images from up to 50-60 feet in back of a vehicle to a 3.5-inch monitor mounted on the dash, and digital signals to turn the system on and off.ack-up cameras send images to a display through wires inside the car, or in the case of some aftermarket equipment, wirelessly, using radio waves or a Bluetooth connection. Automakers configure back-up cameras to transmit images to a vehicle's built-in dashboard display or rearview mirror.