By providing real-time data about what actually happens in on-street spaces, the sensors can help enforce parking laws, move toward smart and flexible curbside pricing, and prevent cruising and traffic congestion.
A press release from the manufacturer (reported on by local blog Roosevelt Island 360) explains how it works:
The new "smart" parking spaces will be outfitted with Streetline's patented parking system which includes ultra-low power sensors that communicate with one another to deliver valuable real-time information, such as how long a car is parked and when a car enters and leaves a parking space. The initial system also lays the foundation for smart parking meters allowing for easier payments and better pricing."
Right now, only 29 spaces have the sensors as the city performs a test run. Once the program spreads, the city is developing an iPhone App that will direct users to empty parking spaces.
Thanks to Noah Kazis
FULL STORY: Roosevelt Island Parking Sensors Will Point the Way to Smart Parking

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

Congressman Proposes Bill to Rename DC Metro “Trump Train”
The Make Autorail Great Again Act would withhold federal funding to the system until the Washington Metropolitan Area Transit Authority (WMATA), rebrands as the Washington Metropolitan Authority for Greater Access (WMAGA).

The Simple Legislative Tool Transforming Vacant Downtowns
In California, Michigan and Georgia, an easy win is bringing dollars — and delight — back to city centers.

The States Losing Rural Delivery Rooms at an Alarming Pace
In some states, as few as 9% of rural hospitals still deliver babies. As a result, rising pre-term births, no adequate pre-term care and "harrowing" close calls are a growing reality.

The Small South Asian Republic Going all in on EVs
Thanks to one simple policy change less than five years ago, 65% of new cars in this Himalayan country are now electric.

DC Backpedals on Bike Lane Protection, Swaps Barriers for Paint
Citing aesthetic concerns, the city is removing the concrete barriers and flexposts that once separated Arizona Avenue cyclists from motor vehicles.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
Smith Gee Studio
City of Charlotte
City of Camden Redevelopment Agency
City of Astoria
Transportation Research & Education Center (TREC) at Portland State University
US High Speed Rail Association
City of Camden Redevelopment Agency
Municipality of Princeton (NJ)