We reported yesterday that NYC DOT has moved “gateway signage” at the entrances to 20 mph Slow Zones from the roadbed to the sidewalk because motorists were running over the signs at what the agency calls an “unsustainable rate.” With some more resources for traffic calming, the agency could take a different approach: upgrading the temporary signs-and-paint treatment to permanent concrete.

Above is a gateway rendering from the NACTO Urban Design Guide, which describes its features:

Curb extensions are often applied at the mouth of an intersection. When installed at the entrance to a residential or low speed street, a curb extension is referred to as a “gateway” treatment and is intended to mark the transition to a slower speed street.

Unlike pedestrian islands in the middle of a street, corner redesigns require rebuilding underground systems, which necessitates the involvement of other city agencies and adds to construction costs. But this level of engineering is what will ultimately make Vision Zero succeed in New York.

And relatively speaking, pedestrian improvements are still cheap. The $55 million Mayor de Blasio wants to spend on ferry infrastructure could build a lot of permanent Slow Zone gateways.

h/t to Doug Gordon at Brooklyn Spoke