When are Trumpet Interchanges generally used?

Trumpet interchanges are specifically designed to facilitate traffic flow where a major highway ends and transitions into another roadway. This configuration allows vehicles exiting the main highway to turn onto a secondary road or highway seamlessly, minimizing disruption and enhancing safety.

In this context, a trumpet interchange is ideal because it provides a dedicated lane for vehicles that are exiting while keeping through traffic on the primary roadway unaffected. This is particularly useful when one highway terminates and there is a need for structured and reliable access to an adjoining road.

Other choices do not accurately describe the primary purpose of trumpet interchanges. For example, although they may occasionally be found near busy areas, their design is not primarily focused on addressing congestion. Similarly, trumpet interchanges are not typically used for the direct interchange of two expressways or for situations where multiple highways intersect, as their functionality caters more to the transition from one primary route to another indirectly connected route.