N.Y.C. Charter § 2906: Section 2906. Improved traffic flow at highway construction sites.

The commissioner may provide that on any city-sponsored, authorized or assisted arterial highway construction site, or major repair site that in the discretion of the commissioner is likely to substantially disrupt traffic, signs be posted at least one half mile or more prior to the area under construction or repair warning motorists of the fact that such work is in progress and, wherever possible, advising of an available alternate route.