Editing Roundabout (section)

=== Signalised roundabouts ===
[[File:Old Market Roundabout, Bristol.jpg|thumb|A major signal-controlled roundabout interchange in central [[Bristol]], England. Vehicles drive on the left, and vehicles in the roundabout are stopped by traffic lights to allow other vehicles to enter, while an [[underpass]] permits straight-through traffic to bypass the roundabout entirely.]]

A signalised roundabout is one where one or more entry is controlled by traffic signals, rather than by assumed priority. For each signalised entry there will also be a signalised stopline immediately upstream on the circulatory section. The signals prevent blocking on the roundabout, and balance and improve traffic capacity.<ref>UK Department for Transport, Signal Controlled Roundabouts LTN 1/09</ref>

Examples include the M50 in Dublin; the Cherry Street roundabout in [[Kowloon]], Hong Kong; Sheriffhall Roundabout in Edinburgh, Scotland; Newton Circus in [[Singapore]]; and many of the roundabouts along the [[Paseo de la Reforma]] in [[Mexico City]].

An evolution of the signalised roundabout has been proposed recently.<ref>{{cite journal |last1=Ibanez |first1=Guillermo |title=Synchronous Roundabouts with Rotating Priority Sectors (SYROPS): High Capacity and Safety for Conventional and Autonomous Vehicles |journal=Electronics |date=2020 |volume=9 |issue=10 |page=1726 |doi=10.3390/electronics9101726 |doi-access=free |hdl=10017/44928 |hdl-access=free }}</ref> It is based in avoiding stops by eliminating conflict points in roundabouts. This proposed new paradigm (SYROPS) forms platoons of vehicles (e.g. 2 x 3 cars) that arrive at the roundabout with speed identical to the average circulation speed in the roundabout and within the time interval (visualised as a rotating priority sector) assigned to his entrance, avoiding all the conflicts of passage and with it the stops and accelerations required in standard and in signalled roundabouts. Signalling signage is with lights for human drivers and optionally wireless for connected and autonomous vehicles.{{undue weight inline|date=October 2022}}