Final answer:
When a side road forms a T intersection with an expressway, it is referred to as an 'intersection' or a 'crossroad.' Traffic on the side road needs to yield to traffic on the expressway, and vehicles can proceed straight or turn left or right onto the expressway. The purpose of the intersection is to provide a means for vehicles on the side road to enter or exit the expressway safely and efficiently.
Step-by-step explanation:
In the context of a T intersection with an expressway, the term 'interchange' is not typically used. An interchange is a facility that allows for the movement of traffic between two or more expressways or highways. However, in this scenario, if a side road forms a T intersection with an expressway, it is more appropriate to refer to it as an 'intersection' or a 'crossroad.'
For example, if a side road intersects with an expressway at a perpendicular angle, it forms a T intersection. In this case, traffic on the side road needs to yield to traffic on the expressway, and vehicles can proceed straight or turn left or right onto the expressway.
The purpose of the intersection is to provide a means for vehicles on the side road to enter or exit the expressway safely and efficiently.