Instructor
CDL Study Buddy Team
Proper mirror usage is one of the most fundamental skills for safe commercial driving, yet many drivers receive minimal training on how to truly maximize their mirrors. This video teaches professional-level mirror techniques that improve both your daily driving safety and your CDL test performance.
The video begins with mirror types and their functions. You will learn the difference between flat (west coast) mirrors and convex (spot) mirrors, and what each is designed for. Flat mirrors provide true distance perception and are used for judging following vehicles and lane-change clearance. Convex mirrors provide a wider field of view but distort distance — objects appear smaller and farther away than they really are — and are used for monitoring blind spots and trailer tracking during turns.
Proper mirror adjustment is demonstrated step by step. For flat mirrors, the instructor shows how to adjust so you see the side of the trailer and the lane next to you, with the horizon approximately one-third from the top of the mirror. For convex mirrors, the adjustment shows the side of the vehicle, the adjacent lanes, and the rear wheels — critical for tracking trailer position during turns and backing. You will see what properly adjusted mirrors look like during a drive.
The mirror scanning technique is explained with timing and priority. The instructor recommends a five-to-eight-second scan cycle: check the road ahead, then left flat mirror, left convex mirror, dashboard gauges, right flat mirror, right convex mirror, and back to the road. This systematic approach ensures you maintain 360-degree awareness without fixating on any single area.
Special attention is given to mirror usage during turns. The instructor demonstrates how to track the trailer through a right turn using the convex mirror on the turning side to watch the trailer's rear wheels relative to the curb or obstacles. You will learn why the flat mirror on the turning side should NOT be used during turns — it loses the trailer too early — and how the convex mirror maintains a view of the trailer throughout the entire turn.
Backing mirror techniques receive detailed coverage specific to CDL test maneuvers. For straight line backing, you use both flat mirrors primarily while convex mirrors confirm lane position. For alley dock and parallel parking, the convex mirror on the dock side becomes your primary tool for tracking the trailer angle and proximity to boundaries.
The video also covers mirror care — keeping mirrors clean and properly tightened so they don't vibrate or shift during driving. A vibrating mirror is essentially useless, and the instructor demonstrates how to check and tighten mirror mounts.
Mastering mirror usage makes every other driving skill easier. Supplement your learning with our CDL practice tests and the FMCSA driver safety resources at https://www.fmcsa.dot.gov/.
