[mikeash]

Which "these programmes" are you referring to?

[nailer]

Jackhammering street concerns and installing rubber bits with a texture that said to help the blind.

[djur]

Could you provide a link? I've never seen rubber bits added to a sidewalk before.

[pmontra]

http://en.wikipedia.org/wiki/Tactile_paving

[mikeash]

Isn't the cost essentially zero if you just install them when you're doing other work?

[nailer]

Depends on the price of the rubber bits or the moulds for the concrete ones.

[Sanddancer]

Concrete molds for curbs are built in-situ to deal with the situation of that particular curb, and the rubber bits are at most $200, so the cost really is fairly negligible.