Public transport priority

Traffic lights are one of the most used methods to control traffic. Local administrations are more and more interested in public transport priority systems, so to encourage the use of public transport over private vehicles in urban areas.

Sky Light Intersection System is an effective instrument for traffic management based on giving priority to public transport, both with reserved lanes and mixed lanes. This is due to the patented optical technology used to detect the length of vehicles with extreme precision and in real time.

Sky Light sensors monitor traffic and transmit information to the traffic light controller via radio through an interface card placed into the traffic controller cabinet.

The controller manages green and red intervals according to the actual traffic situation.

public transport priority

Sky Light Intersection System can be used to control a single traffic signal as well as to coordinate multiple systems.



Elimination of weak points of wiring as layout restrictions and cable break


Easy and fast operations during road maintenance activities


Higher accuracy compared to inductive loops and cameras thanks to patented optical detection


Classification is useful to build Public Transport Priority Systems (buses, trains)


Wireless system for traffic light control


Smart City Trento
Smart City Trento

Trento has been one of the first cities to test Sky Light technology …

Smart Cities Test Plant Bologna
Smart Cities Test Plant

In Bologna one of the biggest test plant has been installed …

Smart City tests at National Research Council in Bologna
Smart City tests at CNR BO

The Smart Services Cooperation Lab in Bologna …

Traffic light control in Rome Flaminio
Traffic lights in Rome

The system has been installed by Citelum, one of the most …

Traffic light control for trams in Padova
Tram at a junction in Padova

A test to detect trains approaching a traffic light

Traffic light control for trams in Rome Aldrovandi
Tram detection in Rome

In November 2014 Nabla Quadro and Roma Servizi per la Mobilità started…

Traffic light control for trains in Rome Casilina
Train priority in Rome

This installation has been completed in June 2015 with Roma Servizi per la Mobilità srl…

Traffic light control in Rome Nomentana
Smart traffic lights in Rome

Sky Light Intersection System has been installed in via Nomentana

Traffic light control in Genova
Sensors vs loops in Genova

A comparison between two technologies for traffic light control

Truck monitoring in Este
Truck monitoring in Este

Urban access regulation needs traffic data to …

Traffic monitoring in L’Aquila
Traffic monitoring in L'Aquila

A big project on traffic monitoring on the …

Traffic monitoring at Tosano shopping mall
Traffic at the shopping mall

Traffic data are useful to understand how many visitors…

Traffic monitoring in Castel Romano
Traffic in Castel Romano

Our first test plant for traffic monitoring

Traffic monitoring in San Benedetto del Tronto
Traffic in San Benedetto

Traffic monitoring with LoRaWAN sensors