→Diamond Interchange: More on straight through
Common in wide open spaces where land acquisition and geography are not concerns, this Interchange design has ramps equally distributed across all 4 quadrants.
In the simplest form, this can be represented as single connections from the ramps to the surface street.
Just be sure to restrict the straight through motion from the exit ramp onto the entrance ramp. This will prevent the routing server from trying to route someone off the freeway just to get back on it.