First, slow down. There are many benefits to slowing down in the rain. Slowing down gives you more time to react to a perilous situation and decreases the seriousness should you have an accident. It is hard to see when it is raining. Water on your windshield combined with the lights of other vehicles may be confusing. A little extra time to access what you are seeing can be the difference between a serious accident and safety. Keeping a safe distance between your car and the cars around you is another way to give yourself more time to react. Slow down so that you are not following the car in front of you too closely. And pay attention to the cars behind you as well.
Second, stay away from extra water. Driving through puddles or around large trucks and buses puts even more water on your windshield. The more water blocking your view, the more danger you are in. Try not to get too close to trucks or buses that are kicking up the water off the road. If you must pass them, try to do it quickly and watch the lines on the road rather than the water being sprayed up. Splashing through puddles not only decreases your visibility but can also cause mechanical problems. The worst that could happen is that water is taken in through the engine's air intake and destroys the engine.
Make sure your vehicle is in the proper shape to handle the rain. Regularly replace wiper blades so you have maximum visibility. Headlights should be in working order so that you can see, and others can see you. Understand what your vehicle can handle. Don't drive through a deep puddle unless you know that it will not affect the mechanical aspects of your vehicle. A good rule of thumb is to make sure that the water stays beneath the doors of your vehicle.
Follow the above advice and you will most likely avoid accidents when driving in the rain.
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