Some curb types can increase the risk of bicycle crashes if struck by a wheel or pedal. The face of curb angle and curb height influence the functional width of the bikeway, crash risk to bicyclists, the ability to exit bikeways, and the risk of encroachment into the bikeway by other users. In locations where the bikeway is located between curbs, it is preferable to provide sloping curbs or reduced height curbs (less than 3-in). For curbs less than 3-in in height there is no minimum shy space; however, shy space to other appurtenances should be carefully considered. For curbs between 3-in and less than 6-in in height, a desirable shy space of 1-ft, with no minimum in constrained conditions, applies. Refer to the current for illustrations on the various TxDOT standard curb types.

Curbs with integral gutters include a longitudinal seam parallel to bicycle travel that may deteriorate, resulting in dips or ridges that increase crash risk for bicyclists. Gutters also may have uneven surfaces where street resurfacing activities do not adequately remove asphalt approaching the gutter. Where curbs are provided with integral gutter, the minimum shy space to the curb is the width of the gutter.