The Independent UK had a short overview of the 240 a few years ago:

The Volvo body design stood the test of time. The cars had thick door bars that linked into the overall structure rather than just “floating” in the door, waiting to hurt the occupants. The roof steel was so strong that car repairers used to use the roofs from wrecked Volvos to patch up the floors of other cars.

In the US, Volvo’s boast was that, for years, the fatality rate in its 240 models was the lowest of any car. Volvo’s safety reflected the work of engineer Nils Bohlin at the advanced Volvo Safety Centre. Bohlin invented the three-point safety belt and pioneered padded cabins.

Via Independent UK