The Ministerial Decree of April 19, 2006 states that "[...] an intersection must be sized with reference to specialized traffic demand in relation to permitted maneuvers. The elements and parameters to be determined based on traffic demand, referring to the peak design period, are: [...] - for roundabout intersections: the capacity of the roundabout and the level of service of the solution adopted; [...] The level of service of the intersection must not be lower than that prescribed by Ministerial Decree 5.11.2001 for the type of roads converging at the junction. [...]

CA.R. is the ideal tool for road designers and public authorities who need to understand whether a roundabout is a valid solution or not, and what level of service it will offer. Its main features are:

• Calculating simple and total capacity using the French SETRA method What is it? and the British Kimber method
  
• the calculation of average waiting times and queue lengths
• Determining the Level of Service (LOS) according to the Highway Capacity Manual method What is it?
  
• there are no theoretical limits on the number of afferent branches
• the software provides calculation reports complete with graphs
• has a simple and intuitive interface
• is available as a standalone program
• is included in the solutions Roads and Railways and Civil Works by CIVIL Design