Powers above, was clearly more interested in the wall-to-wall turn radius of his vehicle, though. The most useful of the two radii is curb-to-curb since that is what most people will encounter in normal driving (as most front bumpers can just fly over curbs - this isn’t the case for something like a Lamborghini, of course), so that’s what we’ll focus on here. The wall-to-wall value will always be larger than the curb-to-curb value and depends on the shape and overhang of the front bumper it basically represents the smallest circle you can turn without potentially hitting something with your bumper. Watch a recording of the webinar with Noel O’Callaghan and Malcolm Mak to learn about the new edition of the Guide.There are actually two turn radii that are normally calculated: curb-to-curb and wall-to-wall.
Since the road network consists of a hierarchy of roads with different functions, it is necessary to have a range of design vehicles in order to provide appropriate and safe access. The swept path is the road area covered by the outermost and innermost points of the vehicle making the low-speed turn. When a long vehicle makes a low-speed turn at an intersection, the rear of the vehicle covers a wider area than the inside of the path of the front of the vehicle. This guide has been developed to assist intersection designers and contains user information and a guide (covering the basis of turning templates and road hierarchy), design vehicle dimensions, and turning path templates.
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