Traveling in your car can definitely be fun but it can also be unexpected when you have problems. No one likes to deal with car trouble and it seems to happen in the most unfavorable place. When you are on a road trip especially when you will be out in the middle of nowhere or in the mountains you may not have many people on the road. Your cellphone may not have a signal or the battery might be dead. I know many times I have needed my phone and it was dead. In these conditions you have to have a plan in place just in case. You have to have the supplies you will need to either fix your car, more gas or things to survive. It's so important to be prepared. Hopefully, you will never need these things but just in case it's better to be safe than sorry. You can keep these items in your trunk so they don't get in the way. If you use them be sure to replenish as needed. Consider investing in a cheap prepaid phone and a car charger in case yours dies.
You can also check your car for visual signs that there may be a problem. You can check the tires and see if they might need air or check the tire tread. It’s always a good idea to have an oil change and tune up before a long road trip especially if you are close to needing one. Also check your lights and windshield wipers for problems.
Remember that traveling can be lots of fun, although it can be a total nightmare if the proper precautions aren't taken. Check out this post about being prepared for unexpected breakdowns.