The southbound W. Carillo Street off-ramp on US 101 in Santa Barbara will be closed overnight 9 p.m.-6 a.m.Tuesday, March 3.

The ramp closure will allow Caltrans to improve and upgrade the cellular towers in order to optimize signal reception in that location.

Message and directional signs will alert travelers in advance of the areas under traffic control. Motorists are advised to allow extra time for travels through the area.