Control the turn transition for the turn template
If you want to include a transition curve into the turn, select Limit Turn Rate; otherwise, the vehicle will be able to turn instantaneously.
Note that there are various official sources of printed templates available, such as the AASHTO Green Book. If you wish to generate templates that match these, you will need to select the correct transition curve, based on lock-to-lock time or distance, or a circular tangential arc. In the case of the AASHTO standard, you should set the transition to Based Upon A Circular Tangential Arc.
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