The car-following behavior of roundabout entrance lane is studied by using liner car-following and regression models for obtaining the car-following behavior to match the liner car-following behavior.However,it is different from the behavior on the road.The value of reaction intensity factor is between 0.2 to 1.0,and the value 0.38 appears relatively more often and accounting for 40%.The swing of car space headway is between stable status and decay swing with the stability analysis,and it is consistent with...