This technology reinforces the tire's structure and sidewalls to withstand the weight of the vehicle and its passengers in case of air pressure loss. When air pressure leaves the tire due to a puncture or other damage, the tire can be driven on for 50 miles up to the speed of 50 mph. This allows the driver to safely arrive at a nearby location, where they can fix or change the damaged tire, instead of being stranded on the side of the road. Run flat tires are typically made for vehicles without space for a spare tire. Run flat tires are heavier than regular tires, as a result, they cannot be mounted together on the same vehicle.