The article says the city claims the biggest issue is federal regulations (the ADA) not city regulations.

My neighborhood in NJ just got those fancy ADA compliant curb ramps last year, along with a repaving. It did take them much longer to install the curb ramps (like a week or two?) than it did to pave (one day) so I can imagine there is a significant cost, even if it's a smaller amount of materials.

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georgefrowny 3 hours ago | parent | next [-]

One wonders if you could prefabricate kerb ramps and drop them in, rather than (I assume) casting them in place.

Maybe they'd settle badly if vehicles drive over them, kick up in the opposite corners and become a trip hazard.

The UK mostly skirts this by using tarmac and paving slabs instead of concrete.

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bombcar 3 hours ago | parent | next [-]

Or make the asphalt "ride up" onto the sidewalk itself, so the complicated part is made of asphalt.

Likely this won't be terribly faster, and I did see the company near us using a machine that was building curb cuts directly.

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georgefrowny 2 hours ago | parent [-]

I looked up kerb cutting machines and it's interesting how much of the process is cutting through cast-in-place kerbs with special saws.

There are hardly any of these in the UK, for example, and kerbs are nearly always made of kerbstones that are sunk into the ground. They have their own problems with sinking when driven on, and I imagine frost heave in areas where the ground freezes seasonally. But it does mean that a dropped kerb installation is quite quick. Most dropped kerbs are simple tarmac ramps rather than concrete castings here.

	▲	bombcar 2 hours ago \| parent \| next [-]
		The ones I saw didn't actually cut the curb - they had arms that held out the form and "built" them in place. I was surprised, as the still-recent but earlier curb cuts had very obvious examples of actual cuts. It was similar to this, perhaps https://www.curbmachines.com
	▲	XorNot 2 hours ago \| parent \| prev [-]
		I wonder if you could just ignore ignore settlement by provisioning for hydraulic slab jacking instead? Include a built channel for injecting hydraulic grout a few months later once the settlements happened to correct it out.

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AlexandrB 2 hours ago | parent | prev [-]

I don't think there's a way to do this without casting something to connect the pre-fab to the surrounding concrete sidewalk. Like how do you precisely cut out the existing curb so the prefab just fits (including elevation/slope) without excessive gaps or something? And if you're pouring concrete anyway, might as well pour the curb itself.

	▲	lstodd 14 minutes ago \| parent [-]
		With prefabs you first dig up both road and sidewalk, set up pre-cut granite curbs (kerbs?) on a mild concrete foundation (negates sinking completely), then repour and repave sidewalk and road. Lasts many years in -20C winters +35C summers climate.

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nonameiguess 2 hours ago | parent | prev [-]

Damn. I've been curious what the deal is with the rubber lego knob coverings on sidewalk ramps and here it is. I mostly notice because they're such hell for skateboarding, so it never occurred to me they'd be an ADA thing as I assume they're equally hard to navigate in a wheelchair, but apparently the idea is to provide a tactile warning that the street is nearby for people with vision impairments.

	▲	cucumber3732842 2 hours ago \| parent [-]
		>I mostly notice because they're such hell for skateboarding, so it never occurred to me they'd be an ADA thing "Be hell for skateboarding" wasn't likely considered a bonus by the disability people because it would rally "those sort of people" to their (otherwise legitimate) cause.