Designing single-Lane dual Carriageways - 2x1 lane
2011 edition (2021 update)
As an addition to established reference documents such as the ICTAAL instruction, the ARP and the VSA guides, this guide is intended for project owners and project managers, and also for consulting firms that wish or need to design interurban roads with two separate single-lane carriageways (2x1 lane).
The characteristics described correspond to new roads outside urban areas and offering no local resident access; they therefore completely or partially exclude some categories of users or vehicles. As such, they are usually qualified as expressways. Adaptation of the characteristics to roads providing local resident access, without the systematic use of barriers to separate the opposing directions of travel, is not covered in this guide. Such adaptation has yet to be examined and its principle validated. The associated technical provisions, as well as those relating to the re-examination of existing roads, may be addressed in subsequent publications.
