Cars are driven only 8% of the time, while potential drivers walk past block after block of underutilized cars.

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The so-called manual-block system takes the place of a dozen separate signals that help drivers adjust their speed and avoid colliding with other trains in the dark tunnels.

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Later this spring, officials said, a second smartphone app will debut, giving drivers and the city near real-time information about the probability of finding a parking space on each block.

WSJ: Parking App Helps Drivers Spot Spaces