Why must a pilot enter "Upwind" when entering the traffic pattern for RWY 9 at Linden (LDJ) airport in New Jersey? The chart supplement procedures require aircraft to enter the traffic pattern "Upwind" for Runway 9 at Linden (LDJ) airport in New Jersey.

Question: Why is this required?

Chart Supplement:





New York Terminal Area Chart cutout showing Linden airport:
link to chart



Picture of "Upwind" leg from the Aeronautical Info Manual:
To keep aircraft away from the multiple obstructions to the east, and also not force people to make their approach from the direction of EWR and mitigate possible conflicts with traffic from that airport.