Ontario Traffic Manual
Book 7 – 2022
Temporary Conditions

3.8 Visibility Considerations
A well-planned and executed traffic control setup effectively communicates information to drivers passing through the work area. Communication is achieved through the placement of signs and devices appropriate for the desired action the driver must take to safely move around the work area.

Key Statement
Visibility of signs and devices in the work area is, therefore, a critical factor to be considered when planning and installing effective traffic control measures.

Work Zones (US National Safety Council)
In 2023:

898 people were killed
40,170 people were injured in work zone crashes.
Work zone crashes are defined as taking place within the boundaries of a work zone or on an approach to or exit from a work zone due to activities, behaviors, or controls related to traffic moving through the work zone.

Of the 898 fatalities:

568 occurred in construction zones
267 occurred in work zones of unknown type
53 occurred in maintenance zones
10 occurred in utility zones