System and procedure for signaling and traffic control of roundabouts with enhanced capacity and safety and lower delays

Summary of the technology

NetIS Research Group of UAH (Madrid) has developed and patented a new system and procedure for roundabout signaling and traffic control, based on grouping the vehicles of each access into platoons and staggering the platoon’s arrival from orthogonal directions of roundabout access. It is offered for patent rights acquisition or international licensing on a per country basis to equipment manufacturers, infrastructure companies and traffic authorities to implement solutions adapted to every specific country or situation. Possible Joint-Venture agreements are contemplated.

Universidad de Alcalá-OTRI

Details of the Technology Offer

The current roundabouts, based on the priority to the vehicles that circulate within it, provide greater security than intersections or crossings, but are quite limited, with medium and heavy traffic, due to the frequent stops of vehicles at their entrance. Major capacity and delay improvements are needed that are applicable to both conventional and autonomous vehicles. Roundabout signaling and control must evolve by integrating traditional signaling technologies and current wireless and sensor networks. Synchronous Rotating Priorities Sectors Roundabouts (SYROPS) is proposed, a new paradigm, different from the current signalized intersections and roundabouts, for the control of traffic in roundabouts and their vicinity based on platoons of vehicles arriving at the roundabout with speed identical to the turning speed in the roundabout and within the time interval assigned to his entrance, avoiding all the conflicts of passage and with it the arrests.

Basic signage is visual and light for human drivers and optionally also wireless for connected vehicles and autonomous vehicles. Capacity improvements depend on design parameters: moderate for small roundabouts, but go up to 70-100% for short distances between vehicles and medium and large roundabouts. Delays are reduced by 28.7% with much less variability, allowing better service levels (LOS) with heavy traffic.

The system can be adopted in any country in the world with the prior approval of the corresponding traffic authority. It is very suitable for improving traffic in roundabouts with heavy traffic. Its basic technology is simple (LEDs, traffic sensors, video cameras, microprocessors) but it can be extended indefinitely with state-of-the-art wireless communications such as VTX (Vehicle to everything), artificial intelligence, etc.

This vehicle access control system to roundabouts operates by forming compact platoons of vehicles that access the roundabout with uniform speed and simultaneously in the entrances from both directions of one direction (eg north and south) but arriving vehicles out of phase with them. the entrances orthogonal to said direction (eg east and west, orthogonal to north and south) by a distance approximately half the length of (or less than) the circumference of the roundabout in its central axis. The entry speed is standardized to a value roughly equal to that of the traffic within the roundabout, and the platoons are appropriately staggered in space and time using moving platoon head signs and sector priority turn signals, which show The turn of the sectors and their duration in an analog way, allowing the drivers of each platoon to naturally anticipate the arrival and the duration of the priority interval of their access. The uniform speed and timing of the arrival of priority vehicles avoid many stops at the entrance of the roundabout. The incorporation of the vehicles to the roundabout can be done with a shorter distance between them and in a much safer way, since the accelerations and decelerations of the participating vehicles are very low, resulting in the twisting of the platoons of vehicles from different accesses with very small relative speeds, which increases safety.

It is important to point out that not only are conflicts between vehicles to enter the roundabout minimized by means of signaling, but conflicts to exit the roundabout are avoided, because in each sector of the roundabout only vehicles with the same access circulate together, similar to what happens. in a revolving access door to a building.


The traffic signaling and regulation system for roundabouts based on rotating light sectors avoids stops at the entrance of the roundabout and eliminates conflicts between vehicles within it to exit, as only vehicles from the same entrance circulate in each half of the roundabout (and respectively from opposite entrances: East and West or North and South).

The absence of stops improves capacity and delays and makes it possible to reduce the distances between vehicles safely, as there are no appreciable changes in speed (even more so in the future as anti-collision devices become widespread). Driving in the roundabout becomes smooth (and less pollutant) instead of stressful with sudden speed changes. The system is suitable for all types of vehicles, manual or automatic driving.

The system can alternate its operation as a conventional roundabout (with priority to those who circulate in the roundabout) in low traffic conditions or emergency situations, with synchronous operation with high traffic. There are no similar products on the market. It creates multiple opportunities for the development of novel display devices.

Related Keywords

  • Industrial manufacturing, Material and Transport Technologies
  • Traffic Engineering / Control Systems
  • Lighting and signaling system
  • Traffic, mobility
  • System and transportation
  • Measurements and Standards
  • Safety
  • Safety & systems
  • Mobility (road, aerospace, marine)
  • Social and Economics concerns
  • Communications

About Universidad de Alcalá-OTRI

The Technology Transfer Office at Alcalá University serves as a liaison between the University and its socioeconomic environment in terms of research and innovation. It encorages collaboration between research groups from universities and companies/institutions, with the objective to promote and commercialize research results and scientific capabilities.

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