ADA curb ramps: a plain-language guide for NJ municipalities and owners

Curb ramps are small pieces of concrete with a lot of rules attached. For towns, counties and property owners in New Jersey, getting the slopes, landings and warning surfaces right is what makes a crossing usable for someone in a wheelchair, using a walker or with low vision. Here's what the current federal guidance says, in plain terms.

Which rules apply?

Two federal documents come up on almost every ramp project:

• The 2010 ADA Standards for Accessible Design, which cover buildings and sites.
• PROWAG, the Access Board's guidelines written specifically for sidewalks, crossings and other pedestrian facilities in the public right-of-way. The final rule took effect September 7, 2023. It is not an enforceable standard until DOJ and DOT adopt it, but many agencies already design to it.

Your project specifications and the agency's standard details control on any given job, so always start there.

The key numbers (PROWAG)

Detectable warnings

The truncated-dome panel at the bottom of the ramp tells someone with low vision they're about to enter the street. It needs to cover the full ramp width, be at least 24 inches deep in the direction of travel and contrast visually with the surrounding surface. Panels that are loose, cracked or worn smooth stop doing their job and are a common item on accessibility audits.

When road work triggers new ramps

The Department of Justice and the Federal Highway Administration issued joint guidance in 2013 on this question. In short:

• Resurfacing is treated as an alteration. That includes a new layer of asphalt, reconstruction, concrete pavement rehabilitation, micro-surfacing and thin-lift overlays, cape seals and in-place asphalt recycling. When a street is altered this way, curb ramps need to be provided or upgraded at the crossings in the project area.
• Maintenance is not an alteration. That includes crack sealing, chip seals, slurry seals, fog seals, pavement patching, diamond grinding and re-striping.
• Several maintenance treatments done together at about the same time can add up to an alteration.

For towns planning a paving program, this means curb ramps belong in the budget and the bid documents from the start.

Common reasons ramps fail inspection

• Running slope or cross slope over the limit, often because the existing grades weren't surveyed before forming
• A lip at the bottom where the ramp meets the gutter
• Water ponding at the bottom of the ramp
• Missing or too-small turning space at the top
• Detectable warnings that are short, misaligned or not contrasting

Most of these are caught by checking grades with a digital level before the pour, not after.