Proximity sensors are mounted on each side of a door in a building. When a person gets close to the door a small pad on the opposite side illuminates, indicating that the door is about to swing open and allowing someone to step aside and not get whacked by the door.
not a very good category, there is no public:safety-- whatrock, Aug 19 2021 Door Opening Warning Light Door_20Opening_20Warning_20Light [bs0u0155, Aug 20 2021] Being safe has never been much of a halfbaked quality. How about a sensor that does the exact opposite? ie indicates that it's safe, but actually assists the action of bashing into whomever gets to the door in second position by having a motorised batting action?-- xenzag, Aug 19 2021 ^ But hurting people would fly in the face of the Help file, and... hmm. Bun for your anno.-- whatrock, Aug 19 2021 I mean something that looked backwards and warned of overtaking cyclists in the typically way to narrow bike lane would be a good thing. Dooring is one of the most common serious accidents involving cyclists.-- MechE, Aug 19 2021 I would like to have revolving doors with strobe lights to see how many tries it takes to exit that door!-- xandram, Aug 19 2021 As unofficial pilots, car drivers should just learn to read 360 degree radar displays. Was going to suggest that cyclists have Bluetooth odometers which tell doors to stay closed, but I fear that will lock in motorists behind them.-- 4and20, Aug 19 2021 About the idea: I don't really think the sensor is necessary. Just always display the open door warning.-- 4and20, Aug 19 2021 //Dooring is one of the most common serious accidents involving cyclists.//
Before I ever got into a door accident I came up with this: <link>.
Since then, I've had two incidents. The first, the door of a 1993 Midnight Blue Corolla, opened suddenly and completely which I just swerved. Sadly, I couldn't swerve back straight before snapping both my left forearm bones on, coincidentally, a 1993 Camry (white) and more importantly, bending my lovely 1986 Quad-Butted Fuji beyond (I think) repair. The Corolla driver, got back in and drove off and I, somehow locked my bike up one handed. I can't replicate that while healthy, so I don't know what's going on there.
The second time I'd been riding my motorbike, so still had my Kevlar jeans, padded shirt and summer motorbike gloves on and on my way to work on my mountain bike, an Explorer(2005-ish?),Opened the door, again, fully and suddenly. I slid the back end around, laid the bike down under the door (handlebars now preventing the door closing) and with something like the "red mist" calmly pulled what with hindsight, was a big chap, out of his car by his hair. 3 seconds, some shouting & pointing at large forearm scars later and sanity resumed. I checked my bike, and left a shell-shocked but hopefully educated guy behind. I wonder how the police would have treated that? Legally, he committed a traffic offence, but I reacted as if it were attempted murder, and frankly committed assault.
Anyhow, I learned lessons. 1. "Racing" derived road bikes are not suitable for transport. Racing is a specific application that requires focused hardware that demands ridiculous compromises for normal use. You can't commute on something that requires a gross change in grip to operate the brakes. Also, the brakes & grip aren't good enough and they're too fast for their own safety in urban environments, and they bend when they hit Camrys.
2. Mountain bikes are hard work and slow, but 2 1/2" tire, disc brakes, suspension and room/leverage to wrestle the thing around make them a better choice. Not as good as an old English 3 speed however, they don't go fast enough to crash, and need no maintenance.-- bs0u0155, Aug 20 2021 Okay, so the first time I read this I missed the building portion, and was thinking cars. Hence my comment.
And yeah, road bikes with single brake levers are not a good idea for actual road riding. Dual levers in the drops and on the flat bar are a better option.-- MechE, Aug 20 2021 //road bikes with single brake levers are not a good idea for actual road riding.//
They're part of my wider thesis that racing ruins everything. Road bikes, or more correctly, road-racing replicas of varying levels of expense shot to popularity in the 70's. But, they're maladapted for people's actual needs. Do you need 12,18,21,24,27 etc. gears? No. Do you need a huge number of gears delivered by a compromised exposed gear train? What you need is 3 gears, fenders/mudguards and a basket. the only reasonable advance in bicycle technology in 70 years is disc brakes.-- bs0u0155, Aug 24 2021 There are definite advantages to more gears, maybe not to the higher end, but I would have extreme difficulty climbing with a three speed. A 3x6 or 2x8 setup isn't that complex.-- MechE, Aug 24 2021 random, halfbakery