Have you wondered why spikes are placed under overheads and bridges? Well there is a simple answer to this.
Overheads and bridges connect roads and reduces congestion among many convenience benefits. Mostly overheads are constructed in towns and commercial areas. Areas where homeless people normally hover around. They usually rest under bridges and overheads.
Spikes and stones are placed under overheads and bridges to keep homeless people from sleeping beneath. It also prevents pedestrians from walking under it.
