If you have a dog and often take it in the car or on long journeys then you may want to invest in a dog seat belt. This is essentially a harness that is fitted round your dog and then clipped on to the regular seat belt fitted within your car. These have been proven to in-case the safety aspect for the dog when travelling but can also assist in safety for the driver as the dog is not able to jump over the seats etc.
When purchasing one of these car accessories it is worth while reading the reviews as some of them state that they do not stay tight meaning the dog can therefore get out or even twist themselves around in it.
Many of the car seat belt harnesses can also be used as a normal walking harness making it easier to get your dog in and out of the car when you arrive / leave your destination.