Travelers will encounter a full closure of Highway 135 (Bell Street) in Los Alamos, 7 a.m.-4 p.m. Saturday, Sept. 26 and Sunday Sept. 27 for the 80th Annual Los Alamos Old Days.

The shut-down will be in place between St. Joseph and August streets, and motorists may experience delays of up to five minutes.

Message and directional signs will alert travelers in advance of the areas under traffic control, according to Caltrans. Motorists are advised to allow additional travel time and use alternative routes when possible.