Home / Alberta / Questions / Road Signs Road Signs Report A steep grade warning sign (with percent): A Trucks only B Steep downgrade ahead — adjust speed C Parking for trucks D No trucks Show Answer & Explanation Correct Answer: B. Steep downgrade ahead — adjust speed Cars should watch for slower trucks; extend distance. Previous Next More Road Signs Questions A 'Pavement Ends / Gravel Ahead' sign: A white rectangular sign 'MAXIMUM 50': A rectangular sign with white arrow on black: A yellow sign with walking pedestrian figure: A white diamond on green sign marks: Often Missed All Alberta Questions Smart Practice Mock Exam Road Signs Guide