Diamond ramps normally have a high-speed condition at one end and an at-grade
intersection with either a stop or a slow turn condition at the other. Upper- to middlerange
design speeds in Table 2.28 are normal near the high-speed facility. Middle- to
lower-range design speeds are usually used closer to the at-grade intersection. Loop
ramps may have a high-speed condition at one end and either a slow- or a high-speed
condition at the other. Loop ramps, because of their relatively short radius, usually have
lower-range design speeds in the middle- and slow-speed end of the ramp, and upper- to
middle-range design speeds nearer the high-speed terminal(s). Directional ramps generally
have high-speed conditions at both ends. They are normally designed using an upperrange
design speed, and the absolute minimum design speed should be from the middle
range.