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The instructions provided describe how to set up a restriction attribute for vehicle height in Network Analyst. Restrictions can be identified for particular elements such that, during an analysis, traversing restricted elements is prohibited entirely, avoided, or even preferred.
It is possible to turn restrictions on and off at solve time using check boxes. Furthermore, a restriction can be checked but only truly restrict the element if a value entered at solve time fits certain criteria. For example, if a vehicle currently being routed is over a given weight, the weight restriction can be checked, vehicle's weight entered, a solve is run and Network Analyst finds the best route that excludes roads where the weight limit would be exceeded.
In all cases, a restriction attribute is defined using a Boolean data type such that each network element either has the restriction (the Boolean value evaluates to true) or doesn't have the restriction (the Boolean value evaluates to false).
Follow the steps below to setup a restriction attribute specific to vehicle height. A network has certain attributes that may not allow for travel on certain segments of road, for example, vehicle height, weight, length, and so forth.
If the vehicle height is greater than the value input in Step 2 for a road segment, the route cannot solve for that road.
The maximum height attribute for the roads is 10. It does not solve along the shortest path because it violates the vehicle height restriction.
If the value of the vehicle height is below the maximum height specified for the road, it solves along that road segment.
This is because the value does not violate the vehicle height restriction.