There is an another fun useful application of the piezoelectrical phenomena.
Lets take a look at modern car tires. They commonly use gas pressure to achieve elastic behavior for a car moving along the road.
Imagine the same wheels, but with piezoelectric elements (just same as in the piezoelectric lighter) with the ability to produce charge at any type of tension – compression or stretching.
Along with dumping effect they will produce a lot of electricity when riding (in any direction), which can be gathered and collected lets say in accumulator.
And if a car is using an electrical power source engine, these feature will let the generators to be charged continuously during the ride and make electrical powered vehicles even much more economical.
For more discussions on this topic – take a look at stack physics