Final answer:
Yes, it is true that you should change lanes or slow down to allow a tailgater to pass, as part of safe driving practices to prevent accidents.
Step-by-step explanation:
True, if you are being followed too closely by another vehicle, or 'tailgated', it is advised to either change lanes or slow down to allow the tailgater to pass. This action is part of defensive driving to avoid potential accidents caused by the tailgater's pressure or impatience. In Peter's driving scenario, even though he felt frustrated by a slower driver, tailgating is dangerous as it reduces the time to react if the front vehicle stops suddenly. Slowing down or changing lanes when safe to do so increases safety for all road users.