Wikipedia:Reference desk/Archives/Science/2023 July 11

= July 11 =

Warning beacons on construction equipment
Over the last few years I've noticed that a lot of diggers etc have two warning beacons: one amber and one green. I understand that the amber beacon is to draw attention to a moving or working machine that may be hazardous, but what is the purpose of the green beacon? I might add that I don't frequent construction sites, but I do frequently get stuck in traffic jams alongside or behind transporters of such equipment! :-( Martin of Sheffield (talk) 08:38, 11 July 2023 (UTC)
 * You don't mention the country. Where I am at (South Carolina, US), I have noticed that a lot of construction equipment has a green light that turns on when the seatbelt is buckled. It turns off when it is unbuckled. I thought it a rather weird thing and I'm not sure if it is some silly government regulation or if there is a secondary purpose for the light. 12.116.29.106 (talk) 12:26, 11 July 2023 (UTC)
 * @Martin of Sheffield: In the UK, they're used show whether the seatbelt is fastened or not. Not to be confused with green flashing lights on emergency vehicles used by medical doctors. See for some more stuff. Bazza (talk) 12:37, 11 July 2023 (UTC)
 * Thanks both. Yes, I'm based in the UK.  The link from  explains it all. Martin of Sheffield (talk) 13:13, 11 July 2023 (UTC)