California Code, Government Code - GOV § 65098.3

(a) Anti-idling signs indicating a three-minute heavy-duty truck engine idling restriction shall be posted at logistics use developments along entrances to the site and at the truck loading bays.

(b) Signs shall be installed at all heavy-duty truck exit driveways directing truck drivers to the truck route as indicated in the truck routing plan, as described in Section 65098.4, and to the state highway system.