Sometimes you will find interchanges which are intersection of two roads, where one road is for exiting and the other road is for entering the freeway. Negotiating these interchanges requires cooperation and communication. Cars exiting have the right-of-way unless there is a safety threat.
A cloverleaf interchange allows for interchange of two freeways with minimal disruption of speed or movement. The cloverleaf usually has characteristic weave lanes as traffic enters from one roadway and exits from another. Curved exits lead to braking and steering problems as drivers adjust from high speed to the speed of a curve.
The diamond interchange allows for interchange of a major roadway with a secondary dual or multi-lane roadway. The diamond interchange may have traffic control devices on the intersecting secondary roadway that allows for left and right turns onto the secondary roadway.
The trumpet interchange allows for interchange of secondary two-way streets to a multi-lane roadway with minimal traffic mix. It takes the place of a T-intersection which is often used when a roadway ends at the intersection of another roadway.
Frontage road Interchange
Frontage road interchanges allow for interchange of vehicles using parallel secondary two-way or one-way roadways and a major multi-lane roadway. Frontage road turnarounds allow drivers to exit a multi-lane roadway and use the opposing frontage road to enter the multi-lane roadway in the opposite direction.