I managed to solve the driving-in-a straight line by calculating the trajectory of the vehicle instead of directly feeding the trajectory as I had done earler. This can be seen in the image below.
But now I have developed another problem such that my vehicle is hitting other cars on the same lane. I thought I would be able to solve this by reducing the value of dist_inc down to 0.3 from 0.5. This worked only on a conditon that the vehicle infront of me was not slowing down. Also my car is violating jerk and acceleration laws.
Now how can I slow down once my vehicle sensors tell it that there is another vehicle infront?
Let me see…