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quick reference tables that direct maintenance personnel to the appropriate mobile and short duration practice(s).

Researchers also recommend the following changes to the work duration definitions used in the Texas MUTCD and TxDOT Traffic Control Plan Standard Sheets to help distinguish between the types of operations (deletions are shown as strikeouts and additions are underlined):

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Mobile is ~ a temporary traffic control zone that moves intermittently (stops up to 15 minutes) or continuously.

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Short duration stationary is ~ a temporary traffic control zone that occupies a location up to 1 hour.

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Short-term stationary is a daytime temporary traffic control zone that occupies a location for more than 1 hour, but less than 12 hours.

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Intermediate-term stationary is a temporary traffic control zone that occupies a location more than one

daylight period up to 3 days, or nighttime work lasting more than 1 hour.

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Long-term stationary is a temporary traffic control zone that occupies a location more than 3 days.

Based on the findings of this research, researchers do not recommend the use of:

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the speed of the work vehicles in a mobile operation,

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the use of the word "slow" to describe the speed of mobile operations, and

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the PASS ON SHOULDER message on a truck-mounted CMS to reiterate the desired motorist action (i.e., to pass the work vehicles to the right on the improved shoulder) on a two-lane, two-way roadway with improved shoulders.

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