You know those metal discs that sometimes appear right in the middle of the road? It turns out they鈥檙e even more dangerous than we thought! Thanks to Nick Dodd for this one

Email your 鈥渇avourite鈥 health and safety pictures to building@ubm.com or upload them to the 黑洞社区 Network at . The sender of every picture published in the magazine receives a 拢25 Marks & Spencer voucher. Please make the pictures as big as possible.