All the major routes to the beaches and mountains will be packed. The GW Bridge and Cross-Bronx will be jammed end-to-end Thursday afternoon to evening and Friday afternoon. The Lincoln Tunnel, LIE, N.J. Turnpike, Goethals and VZ bridges will all feel the brunt of the extra traffic. Roads by airports including the GCP, Van Wyck and Belt will be jammed. Flyers, allow an extra half-hour so you don’t miss your flight.