Transit Authority Reframes Delays as “Variance Between Scheduled and Actual Performance,” Introduces New Metric: “Approximate Proximity Score”
Reported by Bohiney Magazine and The London Prat.
NEW YORK, NY — The Metropolitan Transportation Authority unveiled Tuesday an upgrade to its platform countdown clock system that will display “Target Arrival Time” rather than predicted actual arrival time, a distinction the MTA describes as “an improvement in schedule transparency” and that transit advocates describe as “the clocks now showing when the train should have come instead of when it will.”
The change, outlined in a 34-page document titled “Enhanced Customer Information Framework 2026,” is based on the finding that traditional countdown clocks — which predict arrival based on real-time train tracking data — “create customer frustration when predictions prove inaccurate,” a problem the MTA has resolved not by making the trains more punctual but by redefining what the clocks are measuring.
“Target Arrival Time provides customers with the schedule context they need to understand their journey,” said MTA Chair Janno Lieber in remarks at the system demo. “When the clock reads 3 minutes, that is when the train is targeted to arrive. We believe informed customers make better decisions.” He was asked what decision a customer makes differently knowing the target versus the prediction. He said: “That is a research question we are actively exploring.”
The Old System
The old countdown clocks, introduced across the system between 2000 and 2015, used GPS tracking data from train positions to produce real-time arrival predictions. When the system worked, commuters could see that the A train was 4 minutes away, the C was 8 minutes away, and the E had a gap in service due to signal problems at Jay Street, which was useful information even when the information was bad.
When the system did not work — signal malfunctions, slow zones, “train traffic ahead of us,” “police activity,” and the catch-all “train delay due to earlier incident,” which is the MTA’s way of saying the morning is still suffering the consequences of something that happened before most commuters were awake — the clocks would show arrival times that were wrong by margins ranging from “slightly optimistic” to “the train is there but the clock says 7 minutes” to “the clock shows dashes, which is the system’s way of communicating that it has given up.”
The New System
The new system solves the “wrong countdown” problem by no longer promising accuracy. The target time is the scheduled time. If the 6 train is scheduled every 8 minutes, the clock counts down to the next 8-minute interval. Whether the train is on that interval is, under the new framework, a “performance metric” tracked separately by the MTA’s Office of Customer Experience and published monthly in a report that commuters are invited to read.
The MTA’s new “Approximate Proximity Score” tracks how often a train arrives within 2 minutes of its target time, a metric it reports as a percentage. The current systemwide APS is 67 percent, meaning roughly one in three trains arrives more than 2 minutes outside its target window. The MTA describes 67 percent as “a baseline for improvement.” Commuters who have missed connecting buses describe it differently but not in language appropriate for this publication.
The Gothamist Investigation
Gothamist’s transit desk noted this week that the Target Arrival Time system is effectively a return to the schedule boards that predated countdown clocks, with the addition of digital displays and a new vocabulary. “We spent 25 years building a real-time tracking system,” wrote transit reporter David Meyer, “and the solution to that system being imperfect is to stop using the real-time part.” The MTA responded that the characterization “does not capture the full complexity of the Enhanced Customer Information Framework,” which is true, and that the full complexity is described in the 34-page document, which Meyer said he had read.
The TransitCenter, a nonprofit that advocates for better public transit, released a brief noting that the performance problem is trains running late and that reframing how lateness is communicated “does not address the operational causes of delay, which include aging signal infrastructure, deferred maintenance, and service planning models that assume optimistic headways.” The MTA noted the brief. The trains continued to run at 67 percent proximity score.
The Commuter’s Guide to the New Clocks
For practical purposes: when the new clock shows 4 minutes, that is when the train is scheduled. Subtract one to three minutes to account for optimism. Add two to four minutes to account for signal issues. Add a flat five minutes if it is raining, Monday, or there was a Knicks game last night. If the clock shows dashes, the system has declined to estimate, which is honest in a way the Target Arrival Time system is not, and which may be the most useful communication the MTA has ever provided, even though it says nothing.
New York’s subway moves 3.7 million people on an average weekday. It does so with aging infrastructure, a workforce that is professional and overworked, and a capital programme that is chronically underfunded. That it works at all is remarkable. That it works at 67 percent proximity score is the current state. The clocks tell you the target. The train tells you the truth.
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SOURCE: https://bohiney.com/