The only way to reduce car traffic in agglomerations is to convince residents to use public transport. To do this, it is necessary to provide efficient and fast public transport, which will ensure a competitive time compared to private cars.
From the perspective of road transport, the ideal option is to separate a special "bus lane" which gives priority to buses. Unfortunately, due to the lack of space, high costs or the general deterioration of traffic conditions for other users, such a solution is not always possible.
An even more important issue is to improve the traffic conditions in congested cities for emergency vehicles. At the time of saving a life, when every second is important, it is necessary to ensure safe and quick passage for appropriate services.
In response to the emerging problems, a system of priority service of emergency vehicles and public transport was designed and built.
The principle of operation of the system for public transport, based on the example of the city of Gliwice:
The system is integrated with the city transport management system (ZTM), from which data is collected on the course carried out by a given vehicle and any delay. On this basis, the system "knows" what route the bus / tram will pass through the intersection and what priority should be given to it - zero, low, medium, high - depending on the delay in relation to the timetable. The exact location of the vehicle in the intersection area is performed by an auto-computer and a short-range radio modem. The car-computer is additionally equipped with a 3G modem, enabling remote device diagnostics, configuration and software update. The operation of the priority does not require any action on the part of the vehicle driver.
The entire priority system management system is a central application module ZIR24
The principle of operation of the system for emergency vehicles:
Communication on the vehicle-infrastructure line is carried out using short-range radio modems - at the intersection these are the same devices that are used to prioritize congregation communication, and in vehicles the priority devices (auto-computer) are additionally equipped with a remote control and a magnetic antenna.
The emergency vehicle priority is in principle "red priority, which means that when the emergency vehicle approaches the intersection, the signalling changes to" all red ". This allows all vehicles to stop and the intersection disc is emptied. Then the emergency vehicle, avoiding the stopped vehicles in the left lane, runs through the intersection at a red light. Exceptions to this rule are intersections with one-way inlets (without the possibility of avoiding vehicles stopped at a red light) and pedestrian crossings. In such cases, an "absolute green" priority is used, meaning that only the emergency vehicle approaching entrance receives the green light, while all signal groups not belonging to that entrance (including those with a permissible collision) "receive" a red signal.
The steering remote control is used to activate the priority vehicle priority system. As it is a "red priority", the driver decides to use a red light at his own risk. The pilot is necessary to give him a choice whether he wants to do so, but he cannot be obliged to do so.
Fire brigade, police and ambulance dispatchers have access to the ZIR24 system with the permissions of the account type "observer" your vehicles ". They can see where a given vehicle is located and whether it is requesting priority service, and also have the option to disable priority service for a given vehicle.
Each time the system is adjusted to the requirements of the city / contracting authority, e.g. with a smaller number of priority levels, short-range communication can be eliminated, devices in emergency vehicles can be permanently installed (without magnetic antennas), etc. Each project is scaled for a specific customer.