Surface Preparation - Planing is defined by which features?

• A. Only cleaning
• B. Specified width and depth
• C. Remove only asphalt
• D. Specified texture, grade and cross-slope with variable depth automatic grade controls

Answer: (D)

Planing as surface preparation means creating a prepared surface that has a defined texture, the correct grade, and the proper cross-slope, all controlled by automatic depth adjustments. The texture provides the mechanical key for the new asphalt to bond, while the grade and cross-slope set the surface elevation and drainage geometry for the overlay. Automatic depth control lets the planer vary how much material is removed across the surface, keeping the finished plane uniform even over irregularities. That combination—texture, grade, and cross-slope with variable depth automatic grade controls—is what makes planing a true surface preparation operation. Cleaning alone, removing only asphalt, or focusing solely on width and depth do not guarantee the bond and drainage characteristics needed for a successful overlay.