Run Flat tyres are designed specifically for the purpose of remaining functional, for a limited amount of time, with no air pressure in the tyre.
What this means is that should you suffer a puncture whilst driving, the tyre will still be usable for around fifty miles. This gives you time to drive the car home, or to a nearby garage.
One key safety component required when using Run flat tyres is a tyre pressure monitoring system (TPMS).
With the TPMS, an alert is displayed on your console - letting you know that your vehicle has suffered a puncture and that you will need to replace the tyre as soon as possible.