More comfort, better speed flow for cyclists, fewer red light offences. Leezenflow is connected to traffic lights (Bike-to-X); displays the remaining time in the current traffic light phase via LED module. To calculate the colour gradient, the system combines the traffic light forecast data with the average speed of bicycle traffic at the respective locations, which was first collected in bicycle projects in the city of Münster. Leezenflow is free software (Open Source). The Leezenflow system is designed to promote cycling as part of the mobility transition and digital urban development. The complete installation instructions for the Leezenflow system are freely available on the Internet.