Suddenly, the traffic on the screen began to behave erratically. The virtual cars stopped obeying the rules of the road. They began to clip through each other, accelerating to impossible speeds, then stopping instantly. The realistic simulation devolved into a glitching, chaotic mess of polygons.

Please let me know if you need any changes or if you'd like me to add anything.

VISSIM allows for the assessment of environmental impacts by estimating emissions and fuel consumption under different traffic scenarios.