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The Network Analyst Route solver performs a U-turn at a stop even when the U-turn policy is set to 'Nowhere' or 'Only At Dead Ends'.
This occurs because the routing algorithm assumes the vehicle can pull into a stop, for example, in the driveway or parking lot, and then depart the stop in either direction without it being considered a U-Turn.
Set the CurbApproach property on the stops to constrain the direction in which the vehicle approaches and departs the stops. For example, specify that a stop has a right-hand side curb approach, which forces the vehicle to arrive at and depart from the stop with the stop on the right-hand side of the vehicle. This prevents the vehicle from turning around at the stop.
The CurbApproach setting is only applied to new stops added to the analysis layer.