The Do Not Obstruct D sign 8190 has a symbol on the top and the written words below. It informs people that they should not obstruct an area or restrict access.

If you have a duty to ensure that a route or area is clear of any obstructions, this sign can be an ideal way of protecting it for you. You should not presume that people are going to abide by this instruction unless they are informed through this sign.

Fixing requires anything as simple as sticky pads, 'No-nails' type adhesive or double-sided tape.