The CA MUTCD says,

The function of channelizing devices is to warn road users of conditions created by work activities in or near the roadway and to guide road users. Channelizing devices include cones, tubular markers, channelizers (CA), portable delineators, vertical panels, drums, barricades, and longitudinal channelizing devices. 

When designing a temporary traffic control setup plan, it is critical to know the expected duration of the work activities.  The California Manual on Uniform Traffic Control Devices (CA MUTCD)  defines long, short, and intermediate-term stationary, short duration, and mobile setups and has different requirements for each.

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Civil and Traffic Engineers

engineer's transit         road work ahead sign