Carrera 61609 Lane Change Changing Section Track Part Add On Accessory (2-Pack) Carrera Part No. 61609 2-Pack of Lane Change Track Sections for Carrera GO!!! and Digital 143 Track Sets Each lane change section measures 9-inches long. 1:43 Scale and Compatible with Carrera GO!!! And Digital 143 Tracks Only Must use and even amount of lane change sections at all times.