Model | Limitations |
LRW (Lighthill, Whitham, Richard) OR Continuum Model | ・ Model suggests Preferred speeds ・ Different vehicles have different preferred speeds ・ Predicts abrupt speed change when a vehicle passes through a shockwave, an action that is unrealistic in real world. ・ LWR model fails to predict instabilities of stop-start traffic ・ LWR model assumes zero reaction time which does not happen in real world |
PW Model: Payne-Whitham | ・ Like LRW model, It does not remove all the shock waves ・ Vehicles are expected to adjust their speeds in relation to the rear vehicles, while in reality vehicles respond to thread ・ Proposed wave speeds are greater than traffic speeds. Again primarily because it derives the recommendations from rear vehicles |
Kalman filtering approach | ・ Velocity of an individual vehicle is assumed to correspond to the velocity at that given location ・ The velocity-to-density conversion, introduces error ・ Measurement error in the velocity |