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ADA Compliant Diagonal Curb Ramps

Clear Space

Defini&on: At the bo)om of perpendicular curb ramps, provide a minimum clear space of 4-feet

by 4-feet within the width of the pedestrian street crossing, but en=rely outside of the parallel

vehicle travel lanes. (R304.5.5) “A” in image below is current situa=on at Silo Drive.

Source: h)ps://kp.uky.edu/knowledge-portal/ar=cles/pedestrian-curb-ramps/

Minimums

“If curb ramps are placed diagonally at an

intersec=on, it is important that clear space 48ʺ

long minimum is available at the bo)om that is

outside ac=ve vehicle traffic lanes and is located

within marked crossings, where provided. A

segment of curb at least 24ʺ long beyond flares

must be provided on both sides of curb ramps with

side flares within marked crossings. This curb

segment provides an orien=ng cue at crossings for

people with vision impairments.”

“Recommenda=on: Perpendicular curb ramps are

preferred over diagonal curb ramps. Unless the

radius is large enough, it can be difficult to locate

the clear space at the bo)om of diagonal curb ramps that is outside ac=ve traffic lanes. The

orienta=on also can mislead people with vision impairments who use curb slopes as a cue to

crossings.”

Source: h)ps://www.access-board.gov/ada/guides/chapter-4-ramps-and-curb-ramps/

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Current Condi3ons at Silo Dr

Meanwhile, here’s what’s at Silo Drive – clearly not enough clear space:

Apparently, the current ramps are not compliant with ADA guidelines and it appears that the

RVE plan does not correct this: