The Turning Lane Extension Piecse (TuLEP) is a transit modding project, produced by the NAM Team. Based upon an idea by Chrno, the TuLEP project will consist of a series of modular turn lane puzzle pieces for a variety of networks. These pieces will allow for the construction of variable width turn lanes, as well as a myriad of different lane control options, including double-left turn lanes, as shown by Tarkus in the first development image. Slip Lanes, an oft-requested feature for many years, will also be incorporated into TuLEPs.
The first release of TuLEPs, a "Basic TuLEPs" set, was released as part of the May 2010 NAM.
Current Development Thread at SC4D