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Authorize the Director of Resource Management to add the Truck Routes Map, by addendum, to the Road Improvement Standards and Land Development Requirements
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Published Notice Required? Yes _____ No __ X __
Public Hearing Required? Yes _____ No __X___
DEPARTMENTAL RECOMMENDATION:
The Department of Resource Management recommends that the Board of Supervisors authorize the Director of Resource Management to add the Truck Routes Map, by addendum, to the Road Improvement Standards and Land Development Requirements.
SUMMARY:
Over the last few years, the Department of Resource Management has been responding to various impacts from trucks traveling along unincorporated routes that were not identified for large or heavily loaded vehicles. These impacts include significant pavement damage, inadequate turning radii (resulting in stuck trucks and/or damaged infrastructure), public complaints, and increased accident rates.
The Department has conducted a technical evaluation to identify safe and efficient truck routes, which are defined as roads that are better suited for truck travel based on factors such as existing use, commercial connectivity, structural design, and compatibility with city-designated truck corridors. This designation helps guide future capital project planning and provides the commercial trucking industry with improved wayfinding to reliable routes.
The next step is to formally adopt these designated roads as official truck routes through an addendum to the Road Improvement Standards and Land Development Requirements. With Board approval of the Truck Route Map addendum (Attachment A), the Department will install “Truck Route” signage along the designated corridors. Once the routes are signed, the Department will initiate the comment and public noticing process to establish enforceable load limits and return to the Board at a future date with those recommendations.
FINANCIAL IMPACT:
The cost to implement the truck routes totals approximately $7,500 for signage, funded by the Road Fund. The costs associated with preparing the agenda item are nominal and absorbed by the Department’s FY2025/26 Working Budget. There is no impact to the General Fund.
DISCUSSION:
On April 22, 2025, the Board adopted the current version of the Road Improvement Standards and Land Development Requirements (Standards), which the Department of Resource Management uses for road improvement and development activities within unincorporated Solano County. These updated Standards align with accepted practices in engineering, land surveying and traffic management.
With the Standards now complete, the Department has shifted focus to related statutory updates, including stop signs, speed limits and truck/hauling load limits. A critical part of this process is the development of a formal truck route network that will serve as the foundation for those policies.
To initiate this process, the Department conducted a detailed assessment to designate roads as safe and efficient truck routes that are based on roadway geometry, historical use, connectivity to commercial/industrial areas and alignment with city truck route systems. These routes are not yet legally enforceable but represent the Department’s recommended network for accommodating large vehicle traffic.
With Board approval, these roads will be formally adopted as official truck routes through an addendum to the Standards. This legal designation allows for signage installation, regulatory enforcement, and further load limit protections on alternate roads that are not appropriate for truck use. The California Highway Patrol (CHP), which has been actively enforcing existing weight restrictions, will continue to assist with the evaluation and implementation of new load limits.
Over the last decade, the commercial trucking industry has adapted routes in response to interstate congestion, navigation apps, and fuel costs. Consequently, County roads often become alternate routes during peak congestion periods or offer more direct connections between highways. Many of these roads are experiencing severe pavement damage due to increased truck axle loads-far beyond their original design intent.
Public Works Operations staff have been addressing rutting and edge failures along these routes, while Engineering has had to contract for costly overlay repairs (e.g., Sievers Road and Weber Road). Establishing official truck routes enables the Department to protect less suitable roads by developing targeted load limits in coordination with CHP enforcement.
Truck Route Selection Criteria
Roads were selected for formal designation based on the following:
A. Long-term use as truck routes without weight restrictions
B. Inclusion in existing agreements for truck use
C. Proximity to existing commercial or industrial operations
D. Roadway width, geometry, and structural suitability
E. Direct connection to city-designated truck routes
Proposed Truck Routes
The proposed map in Attachment A identifies:
• Blue lines - City-approved existing truck routes
• Green lines - County roads recommended for official designation
Designated roads (or segments thereof):
1. Fry Road - City of Vacaville to Highway 113
2. Hay Road - Meridian Road to Highway 113
3. Kildeer Road - Potrero Hills Landfill to Scally Road
4. Lake Herman Road - City of Vallejo to quarry entrance
5. Lambie Road - Highway 12 to Goosehaven Road
6. Lewis Road - Hay Road to Midway Road
7. McCormack Road - Canright Road to City of Rio Vista
8. McCrory Road - Northgate Road to Meridian Road
9. Meridian Road - McCrory Road to Fry Road
10. Midway Road - Interstate 80 to Levee Road
11. Pedrick Road - Midway Road to Interstate 80
12. Petersen Road - City of Suisun to Travis AFB Gate
13. Porter Road - Midway Road to City of Dixon
14. Scally Road - Kildeer Road to Highway 12
15. Sparling Lane - Pedrick Road to Interstate 80 at Kidwell
16. Tremont Road - Sparling Lane to Mace Boulevard
Upon Board approval, these roads will be added by addendum to the Standards. Staff will install new “Truck Route” signs and begin the process of implementing enforceable load limits on non-designated routes.
ALTERNATIVES:
The Board may choose not to approve the Truck Routes Map addendum; however, this is not recommended as the designation of official truck routes is a prerequisite to developing new enforceable load limits.
OTHER AGENCY INVOLVEMENT:
Department staff have received input from the California Highway Patrol and the seven cities regarding their existing truck routes.
CAO RECOMMENDATION:
APPROVE DEPARTMENTAL RECOMMENDATION