Schools and retail are zoned differently into a neighborhood. Schools needs access for kids walking, buses, and parents dropping off their kids. Retail needs access for product shipments and shoppers. Residential roads aren't designed for heavy traffic flow or semi-trucks.
A few examples:
Retail:
http://g.co/maps/tj38w
http://g.co/maps/2x2e7
School:
http://g.co/maps/5fe7m
http://g.co/maps/g3hk3
Something interesting about the Home Depot layout is that there is a sidewalk from 7 Mile, but no direct access from Meyers [[pedestrians would have to walk on the yellow striped zone). There are no pedestrian walkways leading to the street behind HD [[Monte-Vista) and that outlot for the drive-thru restaurant has no proper flow and forces people to drive up and around in order to get in and to leave. ALSO, the traffic flowing from 7 Mile goes directly through a parking aisle. Statistically, this is how and where most car accidents happen in a parking lot. This is a particular example of what a horrible big-box urban layout would look like.
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