Pros

It can increase your vehicle's powerStandard cruise control and adaptive cruise control can help you use less fuel on board,

You can find out your chances of getting a speeding ticketWhen using a constant for speed, be sure of the chance of exceeding the speed limit

cons:

It can lead to unexpected results in weather conditionsConstant speed should not be maintained in bad weather conditions, and your body does not naturally adapt to increasing fast distances during rainstorms.