What are crumple zones and how do they work in cars?

What are crumple zones and how do they work in cars?
Crumple zones are zones built into cars that crumple in a controlled manner. The main crumple zones are at the front and the rear of a vehicle. On impact, they crumple up in a controlled manner, which stops the force energy reaching the occupants and injuring them. The crumple zone dissipates the energy Advantage :they save lives by stopping forceful energy Disadvantage: they can kill occupants in severe accidents because in high speed impacts they can dislodge the dashboard from the frame of the body Potential collapse of the footwells, trapping the driver and passenger Crumple zones can be recognised by bent body panels.