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2. Runaway truck ramp - Wikipedia

   en.wikipedia.org/wiki/Runaway_truck_ramp

   A runaway truck ramp, runaway truck lane, escape lane, safety ramp, emergency escape ramp, or truck arrester bed is a traffic device that enables vehicles which are having braking problems to stop safely. It is typically a long, sand- or gravel-filled lane connected to a steep downhill grade section of a main road, and is designed to ...

3. Controlled-access highway - Wikipedia

   en.wikipedia.org/wiki/Controlled-access_highway

   The cloverleaf interchange between US 131, M-6 and 68th Street in Cutlerville, Michigan, United States, shows many of the features of controlled-access highways: entry and exit ramps, median strips for opposing traffic, no at-grade intersections and no direct access to properties.

4. Interstate Highway standards - Wikipedia

   en.wikipedia.org/wiki/Interstate_Highway_standards

   Climbing lanes and emergency escape ramps should be provided where appropriate. Minimum lane width: The minimum lane width is 12 feet (3.7 m), identical to most US and state highways. Shoulder width: The minimum width of the left paved shoulder is 4 feet (1.2 m), and of the right paved shoulder 10 feet (3.0 m). With three or more lanes in each ...

5. Breakover angle - Wikipedia

   en.wikipedia.org/wiki/Breakover_angle

   β° = Breakover angle; C = Underside of chassis; W = Wheel; G = Ground; M = Midpoint of wheelbase Example of a vehicle at a significant breakover angle.. Breakover angle or rampover angle is the maximum possible supplementary angle (usually expressed in degrees) that a vehicle, with at least one forward wheel and one rear wheel, can drive over without the apex of that angle touching any point ...

6. Grade (slope) - Wikipedia

   en.wikipedia.org/wiki/Grade_(slope)

   (This is the angle α opposite the "rise" side of a triangle with a right angle between vertical rise and horizontal run.) as a percentage , the formula for which is 100 × rise run {\displaystyle 100\times {\frac {\text{rise}}{\text{run}}}} which is equivalent to the tangent of the angle of inclination times 100.

7. Truck apron - Wikipedia

   en.wikipedia.org/wiki/Truck_apron

   Truck aprons are between the road portion of the roundabout and the inner circle of the roundabout. [2] On slip lanes, the truck apron is located between the road surface (bitumen) and the sidewalk. Both in roundabouts and slip lanes the truck apron is raised slightly, in an attempt to keep light vehicles on the main road surface.