Parking Space Curb Radius of 2ft- left side Parking Space Curb Radius of 2ft - right side So here is the space marker, ready to use, but unfortunately not parametric. For Parking spaces next to an island or curb, you have to have at least a 2 ft radius on that side for turning. This is a modification of a stock Revit Family that comes with 8.1. Parking Space Curb Radius of 2ft- both sides The radii are parametric, which means you can choose to show all turn angles, just one, or the combination of angles that you want. It is used to verify that the design vehicle will turn without bumping into things, or climibng onto curbs. This is a detail item which shows turning radii for an AASHTO WB-15 trailer truck. The AASHTO Greenbook WB-15 semi truck template, turned detail item. Greenbook WB-15M vehicle turning template Minimum Turning curves for european 16,5m long trucks