A yellow diamond shows a truck on an inclined ramp with an 8% grade notation. What does this sign advise truck drivers specifically?

TRUCK GRADE WARNING SIGNS: An 8% grade means the road drops 8 feet of elevation for every 100 feet of horizontal distance — a significant downgrade for heavy vehicles. TRUCK DRIVER RESPONSE: Select the appropriate low gear BEFORE beginning the descent (gear selection after starting downhill is dangerous — the gearbox may not accept engagement); Use ENGINE BRAKING as the primary retardation method; Apply service brakes in SNUB applications (brief firm application then release) — not continuous application which causes brake fade; CHECK BRAKE TEMPERATURE at posted truck check points; If brakes are hot: pull into a brake check area; RUNAWAY TRUCK RAMPS: On major grades, look for emergency escape ramps (gravel beds or uphill ramps) for use if brakes fail — always better to use a ramp than to crash; WEIGHT MATTERS: A fully loaded 80,000 lb truck has very different brake requirements than an empty truck on the same grade.