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Cruise control automatically maintains a constant speed much like your foot does on the gas pedal. It saves gas, prevents you from getting speeding tickets, and makes long drives easier. However, it has a number of safety drawbacks. Three of these are: It Slows Your Reaction Time When driving without cruise control, your right foot is always at the gas pedal. If a traffic emergency happens, hitting the brakes involves a simple movement of the foot to the left from the gas pedal. This movement is automatic because it has.