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Accessible curb cuts transition from the low side of a curb to the high side (usually 15 cm or 5.9 in change in level). Accessible curb ramps are a minimum of 1 metre (3.28 ft) wide. They are sloped no greater than 1:12 (8.33%), which means that for every 12 cm (4.7 in) of horizontal distance, they rise no more than one centimetre ( 3 ⁄ 8 in).
A curb bit works on several parts of a horse's head and mouth. The bit mouthpiece acts on the bars, tongue and roof of the mouth. The shanks add leverage and place pressure on the poll via the crownpiece of the bridle, to the chin groove via the curb chain, and, especially with a "loose jaw" shank, may act on the sides of the mouth and jaw.