Message boards :
Cafe SETI :
Transportation Safety 3
Message board moderation
Previous · 1 · 2 · 3 · 4 · 5 · 6 · 7 · 8 . . . 189 · Next
Author | Message |
---|---|
Gary Charpentier Send message Joined: 25 Dec 00 Posts: 31001 Credit: 53,134,872 RAC: 32 |
, no license, no insurance, no registration. Different reason. Illegals can't obtain them no matter how good they dive. Drunks can't get them because they are such bad drivers. |
David S Send message Joined: 4 Oct 99 Posts: 18352 Credit: 27,761,924 RAC: 12 |
And one of the most interesting points made towards the end of the show, was that as car safety has improved greatly over the years (suspension, tyres, roads, car strength, ability to absorb impact etc) people's driving has become less cautious, more aggressive/reckless. The safer roads & cars become, the less care people take while driving, so Regarding turning the wheels to the curb, do cars that have automatic parallel parking do that when they finish? David Sitting on my butt while others boldly go, Waiting for a message from a small furry creature from Alpha Centauri. |
Bill Walker Send message Joined: 4 Sep 99 Posts: 3868 Credit: 2,697,267 RAC: 0 |
They would need to know if they were facing uphill or downhill, don't think current cars have a sensor for that. |
betreger Send message Joined: 29 Jun 99 Posts: 11415 Credit: 29,581,041 RAC: 66 |
Cars with stability controls would have accelerometers which would know which way was up. |
Grant (SSSF) Send message Joined: 19 Aug 99 Posts: 13853 Credit: 208,696,464 RAC: 304 |
I'm thinking you'd need inclinometers. Grant Darwin NT |
Gary Charpentier Send message Joined: 25 Dec 00 Posts: 31001 Credit: 53,134,872 RAC: 32 |
No. Accelerometers (3 axis) are what are inside a smartphone and it knows up. After all gravity is an acceleration. Remember your general relativity. |
Grant (SSSF) Send message Joined: 19 Aug 99 Posts: 13853 Credit: 208,696,464 RAC: 304 |
I'm thinking you'd need inclinometers. Yep. But would the accelerometers in a car be sensitive enough to be effective on a slight slope (considering they have to deal with considerable vibration in general operation)? I guess it would depends how good the software is. Grant Darwin NT |
Gary Charpentier Send message Joined: 25 Dec 00 Posts: 31001 Credit: 53,134,872 RAC: 32 |
I'm thinking you'd need inclinometers. Two other things just came to mind: GPS map databse which may have altitude information. How is the software to know there is a curb? Wheels turn a different direction. |
David S Send message Joined: 4 Oct 99 Posts: 18352 Credit: 27,761,924 RAC: 12 |
I'm thinking you'd need inclinometers. I haven't looked into it, but I assume there are sensors to help it navigate into the parking space, which should also tell it whether there's a curb and where it is. David Sitting on my butt while others boldly go, Waiting for a message from a small furry creature from Alpha Centauri. |
Bill Walker Send message Joined: 4 Sep 99 Posts: 3868 Credit: 2,697,267 RAC: 0 |
I'm thinking you'd need inclinometers. Don't count on GPS. It is good to maybe + or - 20 meters. Your moving map looks good because the software clicks you to the nearest road. Watch it when you drive past a shallow Y in the road, it can get tricked and show you on the wrong branch for a few seconds. Car accelerometers I'm familiar with sense horizontal plane accelerations, for anti-skid braking and such. Nothing showing vertical offset. The parking assist sensors look for other cars, not curbs. |
David S Send message Joined: 4 Oct 99 Posts: 18352 Credit: 27,761,924 RAC: 12 |
http://patch.com/illinois/algonquin/s/fsmp2/authorities-id-man-killed-in-tractor-versus-train-crash This hits a bit too close to home. The UP at this crossing is right next to the museum main and west station lead. This might force us to finally put in gates. The two railroads are too close together for one to have gates and the other not. Our gates would have to be linked to theirs. This is complicated by the fact that we're electrified. David Sitting on my butt while others boldly go, Waiting for a message from a small furry creature from Alpha Centauri. |
Grant (SSSF) Send message Joined: 19 Aug 99 Posts: 13853 Credit: 208,696,464 RAC: 304 |
http://patch.com/illinois/algonquin/s/fsmp2/authorities-id-man-killed-in-tractor-versus-train-crash Without seeing that intersection I can't comment on that crash. However the vast majority of crashes at signal less level crossings here are a result of people either not stopping & looking (If they had looked, they'd see the train) or thinking they can beat it, turns out they can't. Whether there are signals, or signals with gates depends on the amount of traffic & the frequency of trains. There are some signals on low traffic crossings due to the location of the crossing on a curve of the track- it's not possible to see the trains until they're there. Grant Darwin NT |
Gary Charpentier Send message Joined: 25 Dec 00 Posts: 31001 Credit: 53,134,872 RAC: 32 |
http://patch.com/illinois/algonquin/s/fsmp2/authorities-id-man-killed-in-tractor-versus-train-crash And I see the Hiway department calls them two seperate crossings. I could see how someone going north seeing the two tracks sign could confuse your two tracks as one and the UP as the second. Also looking at the crossing is there actually enough room for a full size semi to sit between the two RR's? If not it really is a single crossing and mismarked for road drivers. As to signals, electrified might be an issue, but I suspect it will be their equipment and you will have to supply signal indications at their electrical specifications. So you have to put in a relay box to connect to theirs. Of course if you don't have block signals on that track, that is another issue. |
W-K 666 Send message Joined: 18 May 99 Posts: 19393 Credit: 40,757,560 RAC: 67 |
I'm thinking you'd need inclinometers. I don't know about cars, except those fitted with a smart phone, but smart phones also have gyroscopes on all three axis. Which should be able to detect changes of less than a third of a degree of rotation. Gyroscopes measure the speed and angle of rotation of the watch along three different axes i.e. how fast the device is spinning in any of three directions. Accelerometers measure the acceleration of the device along the same axes. Using these sensors together, apps on the phone or watch can detect specific movement. Just to worry you about smart phones, it is possible using the motion detectors, to be able to monitor your keystrokes, and deduce things like passwords and pins. |
Gary Charpentier Send message Joined: 25 Dec 00 Posts: 31001 Credit: 53,134,872 RAC: 32 |
I'm thinking you'd need inclinometers. Well, A single gyro can tell you your latitude. It can sense the rotation of the earth and from that work out how far north or south of the equator you are. I doubt the ones in smart phones are that sensitive though. Give it one more data item, the time (GMT), and it now knows your longitude. It is called an inertial navigation system. As long as it knows the time no matter how it is moved it will always know where it is. Even on a rocket ship to Pluto. |
Dr Who Fan Send message Joined: 8 Jan 01 Posts: 3341 Credit: 715,342 RAC: 4 |
Trucker’s dash cam video shows amazing near miss with a car NEAR COOMA, Australia - A truck driver in Australia had a very close call with a daring driver and the video of his encounter has gone viral. |
rob smith Send message Joined: 7 Mar 03 Posts: 22523 Credit: 416,307,556 RAC: 380 |
People in the car are now in need of new underwear - did you see the puff of (brown) smoke just after the car got back in lane??? Bob Smith Member of Seti PIPPS (Pluto is a Planet Protest Society) Somewhere in the (un)known Universe? |
Sirius B Send message Joined: 26 Dec 00 Posts: 24910 Credit: 3,081,182 RAC: 7 |
People in the car are now in need of new underwear - did you see the puff of (brown) smoke just after the car got back in lane??? I wonder if that was an individual puff or a collective one. :-) Used to get that at least once a day, some of which put my heart in my mouth :-( |
Grant (SSSF) Send message Joined: 19 Aug 99 Posts: 13853 Credit: 208,696,464 RAC: 304 |
Trucker’s dash cam video shows amazing near miss with a car I'm more convinced than ever that even before people go for their driving theory test they need to sit a d&*($head test. If you are one, you don't get to drive a car or truck or ride a bike. If you're that lacking in common sense and/or patience then you'd be a danger to yourself & everyone else on the road; as that video shows so well. Used to get that at least once a day, some of which put my heart in my mouth :-( According to the driver it's not an unusual occurrence, but that one was much, much closer than usual. "This happens too often on the Monaro Highway," he said. "Usually we just ignore it but that close call shook me up a bit and the driver needs to be held accountable." Dashcam footage shows car's near miss with truck on Monaro Highway I think a "dangerous driving" or "driving without due care" charge would be appropriate. Grant Darwin NT |
Wiggo Send message Joined: 24 Jan 00 Posts: 36728 Credit: 261,360,520 RAC: 489 |
Trucker’s dash cam video shows amazing near miss with a car I've been seeing this type of stupidity for over 45yrs now and I still see it on the New England Hwy here often enough (even doing it while going through this village with a 50km/h limit), but some arn't so lucky. Cheers. |
©2024 University of California
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.