NYC subway does major construction work on weekends, which means lines get rerouted or shut down completely. Always check MTA alerts before leaving your hotel.

Common weekend disruptions: N/Q/R/W lines often have service changes affecting Times Square access. 4/5/6 trains frequently run local instead of express on Sundays. L train has periodic shutdowns between 8th Avenue and Bedford Avenue.

Download Citymapper app - it adjusts routes automatically when service changes. MTA's own app is terrible for real-time updates but Citymapper pulls live data and suggests alternatives.