California highway

California has approximately 196,000 miles of roads by length.  Caltrans alone annually manages over 50,000 miles of California’s highway and freeway lanes and maintains approximately 25,000 acres of landscaping.  Compost and mulch applied to land adjacent to roadways improve aesthetics, control erosion, and manage stormwater.  The Caltrans Erosion Control Toolbox provides standards and guidance to its staff and contractors on the use of compost and mulch to design effective and cost-efficient erosion control treatments.  Many local road departments throughout California adopt and use Caltrans standards and guidance on the use of compost and mulch for design and maintenance of lands adjacent to its roads.

The following systems/treatments use compost and mulch along California’s streets and roads network: