Run-flat tyres are designed to give drivers added convenience if they get a puncture. Whereas a traditional tyre will deflate if it loses air pressure, run-flat tyres have strengthened sidewalls, which means you can still drive on them for a short distance after you get a puncture. A light on the dashboard will let you know if you’ve lost pressure in one of your tyres.
Run-flat tyres are only an emergency measure, and are not designed for long-term use following a flat. Most manufacturers only recommend driving for around 50 miles on a punctured run-flat tyre.