Summarize the following:
Tires that are bald or have inadequate tread are unable to maintain good traction with the road, especially in slippery conditions. Having balding tires makes you much more prone to hydroplaning (as well as other tire-related problems like skidding on ice and getting flats). No matter where you live, you're sure to experience wet conditions every once in a while, so be prepared by making sure your tires are in good condition.  Worn tires are more prone to hydroplaning because they have shallow tread depth. A tire with treads that are worn halfway will hydroplane 3–4 mph (4.8–6.4 km/h) slower than fresh tires.  A new tire has a tread depth of around 10/32", and over time this gets worn down. When it reaches 2/32", the tires are considered unsafe to drive on. You can determine whether your tires have enough tread by checking the wear bars. Federal Motor Vehicle Safety Standards require tire manufacturers to make tires with wear bars to indicate how much tread is left. When the tread of the tire is even with the wear bars, it's time for new tires. Try the penny trick to see if you have enough tread. If you can't find the wear bars, stick a penny into the tire's tread with Lincoln's head pointing down. If you can see the top of his head, it's time for new tires. If part of his head is buried in the tread, you can wait to get new tires. Tire rotation is an important way to save the treads on your tires. The type of car you have as well as your driving style can cause some tires to get worn out faster than others. Switching the tires to different wheels periodically prevents tires from wearing down too much on one side. Take your car to a mechanic or tire center and have the tires checked to see if they need to be rotated.  It's customary to rotate tires every 3,000 miles (4,800 km) or so. If you're not sure if your tires have ever been rotated, there's no harm in getting it done just in case. Front wheel drive vehicles need more frequent tire rotation, since this causes the front tires to wear out differently from the back tires. Underinflated tires can make you more likely to hydroplane, since they have more difficulty maintaining good traction with the road. They can also deflect inwards, which makes the tire center higher and traps water easier.  Changes in temperature can cause the pressure in your tires to rise and fall, so it's important to check your tires regularly. Every few months,  check the air pressure in your tires to make sure they're properly inflated.  Each car is a little different, so consult the owner's manual to find out exactly how your tires should be inflated. If necessary, inflate your tires according to the manufacturer's instructions.

Summary:
Make sure your tires have good tread. Rotate tires when necessary. Make sure your tires are inflated properly.