Final answer:
The entrance to a work zone is typically marked by warning signs that alert drivers to upcoming changes and potential hazards. These signs often have bright colours like orange and are accompanied by other safety devices such as cones and barriers.
Step-by-step explanation:
A motorist should recognize the entrance to a work zone by looking for warning signs. These signs are specifically designed to alert drivers to changes in normal traffic patterns and prepare them for potential hazards ahead. Work zones often have signage with bright colours, and orange, and may include cones, barrels, and barriers in addition to signs.
While bright lights and traffic signals are also used for safety and control in different driving situations, they are not the primary method of indicating the start of a work zone. Instead, traffic signals are more commonly associated with intersection control and pedestrian safety. Speed bumps are used to slow down traffic but are not indicators of work zones; their purpose is more commonly found in residential areas or parking situations.