Question What does a "Z" restriction on a license mean? Answers The drive test was taken on a motor scooter or three-wheeled motorcycle. The drive test was taken on a two-wheeled motorcycle. The drive test results are unofficial. Explanation A "Z" restriction on a person's license means that they used a motor scooter or three-wheeled motorcycle for the drive test. Take a FREE Practice Test Now This questions appears in the following tests: Nebraska Practice Test