Reader Alec Melman sent these before-and-after pics of the bikeway on 158th Street in Manhattan, which is now protected with flex posts. The lane is part of a package of Upper Manhattan bike improvements intended to make biking and walking safer between the Hudson River Greenway and the High Bridge.

As you can see in the photo below, before DOT added the posts the lane was vulnerable to incursion by drivers, many with placards, who commandeered the space for parking. The lane runs beneath a Riverside Drive viaduct where NYPD has a fleet service station.

This is the type of low-cost, high-impact improvement that could also make it safer to ride on streets like Chrystie Street, where safety advocates who call themselves the Transformation Department put traffic cones to keep drivers out.

“Now this actually feels safe to bike on,” Melman wrote.