Editing Partial cloverleaf interchange (section)

===B4===
The parclo B4 interchange superficially appears to be a mirror image of the parclo A4. However, the B4 design provides freeway-to-arterial ramps without traffic lights, while traffic turning left from the arterial must cross opposing traffic.  Although this design has the potential to flood the arterial with more freeway traffic than the parclo A4, one particular advantage is the ability to coordinate the traffic signals on the arterial in both directions independently.  This is useful when there is more through-movement traffic on the arterial than turning traffic.