Design Study for the Construction of Turbo Roundabouts under Constrained Site Conditions

Turbo-roundabouts are one of the most frequently recommended road junction design options when it comes to increasing traffic capacity and safety. This is in particular true suburban areas, with dominant flow on main moderate side road. Other intersections handling local considerably constricting availability space usually located vicinity such intersections. Another factor contributing limited land for construction these locations presence surrounding residential housing. Then, choosing suitable turbo-roundabout type becomes issue. The article presents a case study selection turbo roundabout under conditions constricted based analysis provision swept path chosen vehicles. considers standard egg-type turbo-roundabouts, “look-a-like” non-standard “flattened” turbo-roundabouts ellipse-based roundabouts, geometries truck apron central island. For each analysed types, setting-out methods were described detail, allowing designer quickly select specific constrained site conditions. analyses applicability roundabouts three area types: LUDA low urbanisation degree area, BA built-up CDA highly commercially developed along road, wherever not practicable due constraints imposed by existing buildings, canals or any other obstacles found at project site.