Alternative Energy From High Ways

When i was in college, my junior came up with this idea. But no one supported and encouraged him on this. Here goes the idea.

Idea

• Placing some drums in road horizontally, so if any vehicle runs on it, the rods will rotate and based on the  rotation, some energy can be generated. 
• The rotation of the drums would be faster in highways, so more power can be generated.
• It would meet some percentage of electricity consumption

Its not my idea. Its my juniors one and i am saying this because through this post, if this idea has been implemented the sole credit should goto him.