Question A driver can maintain alertness by: Answers Not wearing sunglasses during the day. Keeping the cab warm. Eating heavy foods. Having another person ride with them. Explanation To maintain alertness while driving, strategies include wearing sunglasses to reduce eye strain; maintaining a cool temperature inside the cab; avoiding heavy foods; and traveling with someone else who can share the responsibilities of driving. This questions appears in the following tests: Indiana Class A Knowledge Test Indiana Class B Knowledge Test