Cars
Most of the cars are fragile enough to end the game after a single collision with an obstacle. However there are others that are more sturdy and will take more than one hit. Larger vehicles such as the Lorry Cab, Lorry, Garbage Truck, Fire Truck fall into this category.
Control
Swipe up to move faster. Do this when you have a clear path ahead. Brake when vehicles are approaching from behind. One of the lines on the highway will become colored when this happens. Allow them to pass, then try to avoid anything they left behind. Look at the horizon to decide which route has the least amount of traffic. Also take account of the vehicles that are changing lanes, their turn signals will let you know if they are moving left or right. They usually slow change lanes slowly, allowing you to speed past them before they make their move if space allows.
Positioning
It is easier to avoid traffic by staying in the leftmost or rightmost side of the road. Try to move from the left to the right whenever possible, but always adjust your position based on what is coming up next.
