Final answer:
A speeding ticket in a work zone is indeed often twice as expensive as a normal speeding ticket, serving as a deterrent to unsafe driving practices. Stricter penalties in work zones aim to protect workers and drivers, and traffic signals also help control speeding.
Step-by-step explanation:
It is true that a speeding ticket in a work zone is more expensive, often twice as expensive as a normal speeding ticket. This increased fine serves as a deterrent to ensure the safety of workers and other drivers in the zone. Traffic laws are usually stricter in work zones, with higher penalties for violations such as speeding and using a cell phone while driving. If the null hypothesis stating that 'Being a cell phone user while driving and receiving a speeding violation are independent events' were true, about 28 people would be expected to be both using cell phones and receiving speeding violations according to the fictional data provided.
Furthermore, the presence of a traffic signal can also impact driver behavior. As noted, often vehicles speed through an intersection without regard to the posted limit, whereas a traffic signal would typically induce them to slow down, reducing the chances of speeding through the signal. Thus, enforcement measures and traffic control devices both serve to modify driving behavior for increased road safety.