My car has four "run flat" tyres and no spare which is not an unusual situation in the automotive world these days.

The car's manufacturer promotes the tyres as offering enhanced convenience and safety because the driver no longer has to change a tyre on the side of the road – possibly in the rain.

The punctured tyres can be driven on, at moderate speed, for another 50km (or more) because of their reinforced side walls.

The spin continues: boot/luggage space is increased and running weight is reduced which increases fuel efficiency.

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