You should take the time to properly secure your pet while driving for several reasons. The first is to protect them in the event of a quick stop or a car accident. Your friend should have the same protection you do. The main reason is to prevent them from causing an accident on there own.
Even the most well behaved do can act up during a trip. They can run across the divider and jump into your lap. That’s not much of a problem at a red light but if they do it while you’re merging into another lane on the freeway you may have some serious issues. You need to keep them restrained during drives if you don’t want to risk an accident.
The distraction isn’t the only issue. Dogs and cats can actually cause the accident by messing with the car’s controls. It is common for a small pet to slip behind the brake or step on the gas. This is one sure fire to cause a serious problem on a busy road. Big dogs can even bump the gear shift into neutral. That’s not something you need to deal with in heavy traffic.
The good news is that there are plenty of options to restrain them. You can use adapters to strap them into your car’s seat belt system or you can look into buying a special divider that will at least keep them in the back seat. Keep an eye out though, as new creations are being made each day to make travel easier for your pets. 
Summer is getting ready to go full swing. Now is the time to get ready to shift your behavior into summertime mode. You will have to take extra care to protect your pets during the summer months. Most of these are good ideas for the whole year though.
The first thing to keep in mind is that you can’t leave your pet in the car even for a few minutes. If you take your dog or cat with you anywhere, you need to bring a leash and take them inside. A car can act like an oven and hold in up to 120 degrees of heat in just a few minutes in the sun. This is especially dangerous for dogs. Dogs don’t have sweat glands and can only lose heat through basic panting and light heat transference through their paws. They can suffer from a serious illness if they’re left in the car.
You also need to always have some water available for them. You should keep this in mind for any trip. Your pets can get very thirsty even if they’re inside. You should always give them plenty of water and possibly consider throwing in some ice cubes. You really need to keep them hydrated while they’re outside though. A thirsty dog will also think about drink anything it can find. Summer streets can be full of toxic puddles of antifreeze or even oil. You don’t want them drinking that.
Finally you need to try and give them an opportunity to get out of the sun. It may sound odd but your pets can get a sunburn just like you. This can cause them to peel and suffer greatly. You should try and keep your pets inside during the sunny times while also applying a bit of sun screen to their ears, nose, and lips. 