Principle 2: Ensure Traffic Flow

All TTC plans must be based on an understanding of how motorists drive in real life. For example, the MUTCD states that motorists will not slow down if they do not perceive that slowing down is necessary. That means that the speed of passing vehicles is likely to be a key factor in work zone safety. The TTC plan should recognize and address all factors that introduce more danger when motorists are driving at higher-than-planned speeds. The following are examples of factors that can be dangerous at higher speeds:

• The narrowing of a travel lane
• The closing of a travel lane
• Sudden changes in typical road routing
• Roadway transitions that require quick maneuvers

If possible, any lane closures or route detours should be planned for off-peak hours. This may include working at night in shorter work sessions. In general, if significant roadway interruptions are needed, roadway users should be encouraged to use alternative routes during the construction period. Planning will be required to make this happen.

To learn more about Roadway Temporary Traffic Control visit our Construction Roadway Temporary Traffic Control Online Training web page.