What is the principle of luminous road photoluminescent pigment

Netherlands magical luminous paint can put to use to replace street lights? 

According to the BBC recently reported that Photoluminescent Gravel‍ the Dutch 500-meter long section of the highway will be the end of the light-emitting into the trial. The N329 road near Oslo City Highway, road markings using fluorescent paint, after charging in daylight, at night more than eight hours of continuous green fluorescence, thereby replacing the lights. The designer of the road expressed the hope that through this program to save energy, reduce costs and improve road safety purposes.
Questions: 

What is the principle of luminous road? What's the difference with the traditional road reflective logo? It really can save energy and replace street lights? 

Answer:
According to media reports, the nature of the road is the use of light-emitting a glow in the dark fluorescent powder to make signs, the roads automatic light.

Road use light-emitting phosphors are long afterglow luminescent powder." Recently, Professor of Shanghai Jiaotong University Daide Chang told reporters that this material can absorb sun light during the day, at night and gradually release the green light. 

The material is sent only light in a dark environment, the eyes can be felt during the day feel." Professor of Chemistry and Molecular Engineering, East China University of Technology Shen Yongjia further explained to reporters, also called afterglow luminescent powder luminescent materials, in natural light irradiation, or other artificial light sources that can store energy of the external optical radiation, and at a photoluminescent paint‍ temperature (room temperature) and for a long period of time to slowly release the stored energy in the form of visible light luminescent materials.

It is understood that since has good luminescent properties, since the 1990s, long afterglow luminescent powder began to receive widespread attention, and began to apply at night signs, emergency lighting and light-emitting ceramic.