A new CMS would be installed facing northbound traffic on the northbound shoulder of US Highway 101 near Leggett in Mendocino County (post mile R90.0).
The purpose of this project is to communicate upcoming roadway conditions to the traveling public so they can make informed driving decisions. The project is needed because this section of US 101 is remote and road conditions can change suddenly. The segment of highway between Leggett and Confusion Hill experienced 135 collisions over a 5-year period. A CMS would fulfill the project purpose by informing road users of closures or other safety concerns.
The project would install a new electrical service pedestal, 334 cabinet, 700 series CMS, 35-foot pole with a camera, and traffic census station on US Route 101 in Mendocino County at PM R90.0 near Leggett.
The CMS would be 25 feet wide by 7 feet tall. The sign would sit upon a 35-foot pole, which would be anchored by a 5-foot diameter cast-in-drilled-hole (CIDH) pile buried 22 feet below ground. The camera pole would also have a 2.5-foot diameter CIDH pile installed 8 feet below ground. The traffic census station would be set within the existing roadway surface.
Each electrical element would be buried in a trench 2.5 feet deep leading to the electrical service pedestal. The service pedestal would be a 5-foot by 17-foot by 4-inch concrete pad to support the 334 cabinet and pull boxes for the CMS, camera, and census station. The total length of trenching would be approximately 800 feet. Trenching would occur through a wetted area on the northbound side of the shoulder.
Total disturbed soil area (DSA) would be approximately 16,000 square feet (0.37 acre). The project would take approximately 30 working days. No trees are proposed to be removed. No new permanent noise would result from this project and construction noise would not rise above current roadside traffic noise.