THE MATRIX CITY SAMPLE - stuck while rendering

Hi I am trying to create a shotin the Matrix City Sample, Its a simple shot where I have placed my hero Car on the highway and the camera moving up showing the cityscape, everytime i render it, it either has the background cars missing, or my hero car does not move forward, I am currently playing this in UE 5.3, and the houdini version is 19.5, all tutorials i have watched it says that it is correct, please help if possible.