Basic Control Skills - CDL Manual Section 12M
Section 12M measures low-speed vehicle control, not speed or traffic judgment. You must move a passenger vehicle through marked exercises-typically straight-line backing, offset backing, alley docking, and parallel parking-while staying inside boundaries, avoiding cones, and finishing in the required position. The examiner scores encroachments, pull-ups, final placement, and safe observation.
Control the exercise
Adjust the seat and both mirrors before moving; fasten the belt and check that the path is clear. Use walking-pace speed and small steering corrections. Track the vehicle's rear corners in both mirrors and turn your head to cover the blind spot. If the vehicle drifts, stop before a boundary is crossed and use an allowed pull-up to reset. Finish straight and fully inside the box; a correct path that ends short or crooked still loses points.
Worked example
In straight-line backing, pull forward until the vehicle is aligned with the lane, stop, and check both mirrors. Back slowly; if the rear moves toward the left line, steer slightly right to bring it back, then straighten. Do not stare at one mirror-alternate left, right, and direct observation. If you cannot see the rear marker, stop and correct rather than guessing. The reasoning is simple: at low speed, a small correction now prevents a large correction-or a boundary hit-later.
Traps that cost marks
Forgetting to adjust mirrors, watching only one side, oversteering, backing too fast, continuing after an encroachment, and stopping with the bumper short of the final marker. Some candidates also forget a required signal or fail to check for pedestrians before moving. Treat each exercise as a separate scored event: complete it, stop, and reset your reference points before the next one.