Delhi to Mussoorie drive mostly the roads are three lane but unfortunately most people don’t know how to drive on highways so this tweet. The inner most / right most lane is for overtaking so once u overtake a vehicle come back to middle lane. 
The outer most lane is for slow drive. If u r enjoying your drive at slow speed go there. It is the safest bet to be on the middle lane on the highways. The slower vehicles will mostly be on your left while the faster ones will easily overtake you from the right.
So, the structure works as slow, medium and fast as you move from the leftmost to the rightmost lane. In case you are in the rightmost lane and a faster vehicle is behind you, just indicate to the left and give him/her way.
Explaining few more rules about lane driving for people who purchased driving license and are not aware. On various roads u will see a broken wire line. A broken white line gives you permission to change lanes, overtake and take U-turns.
On a continuous white line you are not allowed to overtake other vehicles or take U-turns. If you are on this type of road, just keep moving straight. Crossing the line is only allowed.
When u see Single yellow line, overtaking is allowed but only in your own side. Crossing the yellow line isn’t permitted for either side. These roads are usually seen in areas with low visibility.
A Double Continuous Yellow line implies that crossing the line is strictly not permitted for either side. So that implies no overtaking, no U-turns or no lane changes. This is where probability of accident is highest so stick to ur lane.
