Project Semaphores solve the problem of the traffic playground in Bratislava. Obsolete and dysfunctional traffic playground became a place of traffic education for young visitors thanks to our project. Outdated wiring stopped being dangerous thanks to the replacement of 230V AC power lamps by 24V DC. Modern electronics replaced old, analogue and almost non-functional one. Configurable microprocessor controlled unit helped to ease configuration and adaptation of prevailing conditions. Power field was originally made from a petrol generator, replaced by environmentally friendly and renewable source by using solar energy through solar panels and batteries. Replacing obsolete 50 watt bulbs for modern LEDs has dropped demands for energy consumption fifty times. Field is currently used and is safe and fully functional for its users.