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C. 4

To:	Board of Supervisors
From:	Brian M. Balbas, Public Works Director/Chief Engineer
Date:	October 4, 2022

Contra

Costa

County

Subject:

Establish a speed limit of 25 mph on Castle Rock Road (Road No. 4164E), Walnut Creek area.

APPROVE	OTHER
RECOMMENDATION OF CNTY ADMINISTRATOR	RECOMMENDATION OF BOARD COMMITTEE

Action of Board On: 10/04/2022

APPROVED AS RECOMMENDED

OTHER

Clerks Notes:

VOTE OF SUPERVISORS

AYE:

John Gioia, District I Supervisor
Candace Andersen, District II Supervisor
Diane Burgis, District III Supervisor
Karen Mitchoff, District IV Supervisor
Federal D. Glover, District V Supervisor

Contact:

Monish Sen, 925.313.2187

I hereby certify that this is a true and correct copy of an action taken and entered on the minutes of the Board of Supervisors on the date shown.
ATTESTED: October 4, 2022
Monica Nino, County Administrator

BY:	, Deputy

RECOMMENDATION(S):

RESCIND Traffic Resolution No. 1988/3277 and ADOPT Traffic Resolution No. 2022/4525 to establish a speed limit of 25 miles per hour (mph) on Castle Rock Road (Road No. 4164E), extending from 300 feet north of Pine Creek Road (Road No. 4657E) and terminating at the Castle Rock Regional Park entrance, as recommended by the Public Works Director, Walnut Creek area. (District IV)

FISCAL IMPACT:

No fiscal impact.

BACKGROUND:

Castle Rock Road is classified as a Major Collector roadway by the Federal Highway Administration. Such a classification requires that the speed limit be set according to standards prescribed in the California Manual on Uniform Traffic Control Devices (CA MUTCD) and California Vehicle Code (CVC) 22358, if the speed limit is to be set lower than the prima facie speed limit of 55 or 65 miles per hour (mph). This requires an Engineering and Traffic Survey (E&TS) to be conducted to establish an appropriate speed limit.

BACKGROUND: (CONT'D)

On August 30, 2022, an E&TS was conducted according to established traffic engineering practices on a section of Castle Rock Road. Based on the results of the E&TS, the Traffic Engineer recommends establishing a 25 mph speed limit on Castle Rock Road, beginning approximately 300 feet north of Pine Creek Road (at the City limits of Walnut Creek) and extending south to Castle Rock Regional Park.

This Board of Supervisors action will also rescind Traffic Resolution No. 1988/3277, which had established the current 30 mph speed limit on Castle Rock Road.

CONSEQUENCE OF NEGATIVE ACTION:

The current speed limit on Castle Rock Road would remain.