Practise makes perfect
The starting point is to get your dog used to the car and more likely to travel quietly and arrive calmly. Firstly, make sure he has somewhere in the car to travel that is secure, comfortable, and safe, where he can't interfere with you and your driving, and where he is contained in case of an accident.
1) Spend some time putting your dog into the car and giving him treats in there - first with the boot open...
2) ...and then with it closed.
3) You can even feed him his dinner in the car, or give him a stuffed Kong or similar, so he knows that it is a place where good things happen. Start with the engine off, and then on (with the boot closed). Take him for short drives around the block and bring him back again. Many dogs become crazy travellers because they are only ever taken out for a fabulous walk, agility classes, or something equally exciting - while others only go in the car for visits to the vet.
Good car manners make the dog
It is dangerous for your dog to leap out of the car the second you open the door, without giving you the chance to put him on the lead. Not only that, but it means you start your walk totally out of control. How often have you seen dog arguments in the car park, dogs charging off, or the area covered in dog poo because owners just open the back and their dog leaps out and vanishes off into the distance?
Practise this at home, somewhere safe and secure, before doing it for real at the start of a walk.
1) First make sure your dog can do a short wait (in either a sit or a down). Before you let him get out of the car, ask him to wait.
2) You need to teach him to wait while you open the car and crate...
3) ...and attach the lead to his collar. Give him a treat for doing so - otherwise the thrill of charging off will be far more rewarding for him than staying put.
Once you have him on the lead, you can give him a release command so he can jump out. Then ask him to sit for another treat while you close the boot, lock your car, and get ready to set off on your walk totally prepared and in control. Once you and your dog can do this at home, you can start putting it into practice when you are out and about. Start somewhere quiet where there aren't many distractions, before building up to doing it in a busy area with lots of dogs, or at the side of a road, where these skills are vital.