As we know, Solar Power is a Clean & Free Energy Source, but still its not Implemented to it Full Extents, i.e. Not Everywhere,
As stated in Idea, There will be Multiple Advertisements on Roads (Side Lane Road & Road Divider), which cover the Major Cost of Installation of Solar Panels above the Road.
If 1 Meter (Width) Advertisement Boards are Provided to Advertisers & Height of those boards can be any, either 1, 2, 3, 4, 5 Meter or Above, than around 4000 Advertisers can advertise in 1 KM Road,& hence the total Installation cost will be divided by 4000, which helps in reducing cost for Individual Advertisers to advertise on Roads.
So, FUNDS by Advertisers, Solves the Issue of High Installation Cost, & Hence Solar Panels Can be Installed Easily on Roads.