Some lanes have markings farther down the lane called range finders. Not all lanes have these markings, because it depends on the type of lane and the manufacturer of the lane. Lanes are either made out of wood or a synthetic material. All modern lanes today are synthetic. They are a very hard material that is similar to a Formica counter top. All lanes with range finders are synthetic lanes.
The first set of range finders start 34 feet from the foul line and are 3 feet long. They are located on board 15 for both the left and right handed bowlers. The second set of range finders start 40 feet down the lane and are 3 feet long. They are located on board 10 for both the left and right handed bowlers.
The range finders are used to help the bowlers that roll a hook or curve ball. When the ball travels down the lane, it will hold a path in the same direction for a specific distance. The ball will them come out of the path and start to hook in an inward direction (towards a higher numbered board).
The distance the ball stays in the path and starts to move inward will vary based on the length of the oil on the lane. In most cases the ball will start its path inward around the second range finder (40 to 43 feet). Learning to see the ball motion down lane is an acquired skill that can take years of practice to master.