Groton — Those with access to the Naval Submarine Base may experience delays and a change in traffic patterns near the base's main gate as the intersection of Crystal Lake Road and Military Highway will be under construction through Nov. 18.

In addition to possible delays and changed traffic patterns, the main gate will be closed to all inbound and outbound vehicle traffic from 10 p.m. through 5:45 a.m. from Nov. 12 through Nov. 15.  Pedestrian access at the main gate will be unaffected.

During the closure, Gate 5 along Route 12, commonly referred to as the "hospital gate," will be open for inbound and outbound vehicle traffic.