Category: Accuracy
Topic: Accuracy
Answer: The simulation models in AutoTURN are built based on the design vehicles and their turning characteristics, as presented in their respective design guidelines (e.g., AASHTO), in the form of turning templates. As such, the simulation model is intended to achieve the same level of accuracy as specified in the design guideline. In these design guidelines, the design vehicle often represents the worst-case vehicle (i.e. larger dimensions, more limiting steering angle) of its class. Because the simulation model replicates the guideline, the simulation results are often deemed conservative in comparison to actual vehicles on the road.
For realistic vehicles, we have verified the accuracy of simulated results (AutoTURN) with field tests. From our field tests, if the simulation model is configured according to the vehicle manufacturer's specifications for its dimensions and steering angle, then the swept path of the tire tracks may differ by within 3% when field results are compared against simulation results.