Turn signals, a must
Drive during daylight on long journeys
The major factor to road accidents is the motor vehicle speed. Many people drive to the maximum of the speed limit and even toe the line. The problem with driving that fast is that even the smallest mistake can spiral out of control. At high speeds, even being distracted for a second can be dangerous. If you sneezed while driving at 120kmph, it would only take a couple of seconds but you would have travelled 100m with your eyes closed.
Slowing down your vehicle builds up time to react and avoid a potential car accident. The impact from a collision is in direct correlation to speed, hence slowing down your vehicle saves lives.