This paper focused on energy efficiency increase for Smart street lighting systems with movement detection sensors. The measurements on Pilot Sites show a high potential to reduce energy consumption in the first years after installation, primarily if good quality LED luminaires are in use. In the third chapter, a new approach for movement detection sensors presents. It enables a data sensing dimension, enabling a new traffic intensity adaptive control algorithm that assists in regulating the lighting to required power values according to actual traffic intensity and M or C class during the whole nighttime. It keeps maximum power when traffic is present and minimum when there is no traffic, thus achieving maximum energy efficiency while at the same time maintaining lighting quality and maximum safety.