As speed starts increasing game starts lagging. After a while, your swipe's reaction will start slowing down. So while trying to jump or change lane this will result in either colliding with a train or the obstruction. *Also there are some areas where you are directly met with a train or obstruction with no clear vision. So when you slide down the obstruction behind it is a train that is not visible beforehand. *A good game but this issue makes it unplayable.