Two main types of freeway interchanges are the diamond interchange and the cloverleaf interchange.
Diamond Interchange[change | change source]
A diamond interchange has four ramps where they enter and leave the freeway at a small angle and meet the non-freeway at almost right angles. These ramps at the non-freeway can be controlled through stop signs or traffic signals. The name comes from the diamond-like shape.
Cloverleaf Interchange[change | change source]
A cloverleaf interchange has two levels and four ramps which handle all traffic without stop signs or traffic lights. To turn left, traffic goes in a 270° turn. The name comes from the four-leaf clover-like shape.