40-40139 – Danger – ACID – 600×450
40-40020 – Hazard – Laser Beam Hazard 450 x 600
40-40108 – Danger – Demolition Work in Progress
40-40004 – Hazard – Beware Of Crane – 450 x 600
40-40106 – Danger – Construction Site Unauthorised Persons Keep Out