Culture
Ask CityLab: Why Won't Subway Doors Reopen When I Try to Squeeze Through?
Stand clear of the closing doors, please.
Ask CityLab is where we answer thorny questions about urban life. Email your Q's to AskCityLab@CityLab.com.
Doors equipped with “sensitive edges” will reopen when an obstruction—like, say, your arm, leg, or bag—is detected. Then, the doors either close automatically, or the train conductor has to manually initiate the sequence.