How is traffic microsimulation applied in transportation analysis?

Microsimulation models individual vehicle movements using car-following (spacing), lane-changing, and gap-acceptance rules. Applications: complex interchanges, work zones, signal timing optimization, transit operations, pedestrian interactions. Process: network coding, demand input (O-D matrices or turning counts), calibration (match field volumes, speeds, queues), validation on independent data, scenario analysis. Tools: VISSIM, CORSIM, Aimsun, Paramics. Challenges include proper calibration of driving behavior parameters, network detail, and sufficient replications for statistical validity of stochastic results.