Informational reference only. Not legal advice. Verify with the governing authority before you build.
Scenario · California

Close a lane (work zone) in California

Exact close a lane (work zone) compliance requirements for California: what is required, who is responsible, and the citations. Every figure traces to primary law.

Verified Jul 2026 Governed by: California Legislature (Cal. Veh. Code) · California Department of Industrial Relations (Cal/OSHA)

Construction-zone speed limit signs placed within 400 feet of each end

Appropriate signs indicating the limits of the restricted zone and the applicable speed limit shall be placed by the agency within 400 feet of each end of the zone; signs shall display the figures indicating the applicable limit and indicate the purpose of the speed restriction.

22362 California Legislature Verified Jul 2026

Minimum posted speed limit in construction/maintenance zones

The posted speed limit in a construction/maintenance zone shall not be less than 25 miles per hour.

22362 California Legislature Verified Jul 2026

Double fines in Safety Enhancement-Double Fine Zones require posted controls

For specified offenses committed within a designated Safety Enhancement-Double Fine Zone, the fine in a misdemeanor case shall be double the amount otherwise prescribed and in an infraction case shall be one category higher; this applies only when traffic controls or warning signs have been placed pursuant to Section 97 or 97.1 of the Streets and Highways Code.

42010(a)42010(c) California LegislatureCalifornia Legislature Verified Jul 2026

Traffic control must conform to California MUTCD

Where a hazard exists to employees because of traffic or haulage conditions at work sites that encroach upon public streets or highways, a system of traffic controls in conformance with the "California Manual on Uniform Traffic Control Devices for Streets and Highways, January 13, 2012" shall be required so as to abate the hazard.

1598(a) California Division of Occupational Safety and Health (Cal/OSHA) Verified Jul 2026

Size and design of traffic control devices per the Manual

Specifications for the size and design of signs, lights, and devices used for traffic control shall be as described in the Manual, pursuant to California Vehicle Code Section 21400.

1598(b) California Division of Occupational Safety and Health (Cal/OSHA) Verified Jul 2026

High-visibility warning garments for employees exposed to traffic

Employees (on foot) exposed to the hazard of vehicular traffic shall wear warning garments such as vests, jackets, or shirts manufactured in accordance with ANSI/ISEA 107-2004, High Visibility Safety Apparel and Headwear.

1598(c) California Division of Occupational Safety and Health (Cal/OSHA) Verified Jul 2026

Retroreflective warning garments during darkness (visible at 1,000 feet)

During hours of darkness, warning garments shall be retroreflective and manufactured in accordance with ANSI/ISEA 107-2004; the retroreflective material shall be visible at a minimum of 1,000 feet.

1598(d) California Division of Occupational Safety and Health (Cal/OSHA) Verified Jul 2026

Flaggers required where barricades and warning signs cannot control traffic

A flagger or flaggers shall be utilized at locations on a construction site where barricades and warning signs cannot control the moving traffic; the number of flaggers and their deployment shall be according to the California MUTCD, January 13, 2012.

1599(a) California Division of Occupational Safety and Health (Cal/OSHA) Verified Jul 2026

Placement of warning signs per the Manual

Placement of warning signs shall be according to the Manual.

1599(c) California Division of Occupational Safety and Health (Cal/OSHA) Verified Jul 2026

Flagger station illumination and reflectorized garments during darkness

During hours of darkness, flaggers' stations shall be illuminated such that the flagger will be clearly visible to approaching traffic, and flaggers shall be outfitted with reflectorized garments manufactured per ANSI/ISEA 107-2004; the retroreflective material shall be visible at a minimum distance of 1,000 feet.

1599(e) California Division of Occupational Safety and Health (Cal/OSHA) Verified Jul 2026

Flagger training required before assignment

Flaggers shall be trained in the proper fundamentals of flagging moving traffic before being assigned; signaling directions shall conform to the Manual, and training shall cover flagger equipment, work-zone layout, stop/proceed/slow signals, one-way traffic control, emergency vehicles, hostile drivers, and single-flagger procedures, with documentation maintained per Section 3203.

1599(g) California Division of Occupational Safety and Health (Cal/OSHA) Verified Jul 2026

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Sources

  1. Cal. Veh. Code 22362 - Prima facie speed limit in construction/maintenance zones (22362)
  2. Cal. Veh. Code 22362 - Prima facie speed limit in construction/maintenance zones (22362)
  3. Cal. Veh. Code 42010 - Safety Enhancement-Double Fine Zones (42010(a))
  4. Cal. Veh. Code 42010 - Safety Enhancement-Double Fine Zones (42010(c))
  5. 8 CCR 1598 - Traffic Control (Cal/OSHA Construction Safety Orders) (1598(a))
  6. 8 CCR 1598 - Traffic Control (Cal/OSHA Construction Safety Orders) (1598(b))
  7. 8 CCR 1598 - Traffic Control (Cal/OSHA Construction Safety Orders) (1598(c))
  8. 8 CCR 1598 - Traffic Control (Cal/OSHA Construction Safety Orders) (1598(d))
  9. 8 CCR 1599 - Flaggers (Cal/OSHA Construction Safety Orders) (1599(a))
  10. 8 CCR 1599 - Flaggers (Cal/OSHA Construction Safety Orders) (1599(c))
  11. 8 CCR 1599 - Flaggers (Cal/OSHA Construction Safety Orders) (1599(e))
  12. 8 CCR 1599 - Flaggers (Cal/OSHA Construction Safety Orders) (1599(g))

Informational only, not legal advice. Verify with your local building department and the current standards before you build.

Last verified Jul 2026