The following warnings occurred:

Warning [2] Undefined variable $awaitingusers - Line: 33 - File: global.php(779) : eval()'d code PHP 8.1.27 (Linux) File Line Function /global.php(779) : eval()'d code 33 errorHandler->error /global.php 779 eval /printthread.php 16 require_once Warning [2] Undefined array key "style" - Line: 837 - File: global.php PHP 8.1.27 (Linux) File Line Function /global.php 837 errorHandler->error /printthread.php 16 require_once Warning [2] Undefined property: MyLanguage::$lang_select_default - Line: 4950 - File: inc/functions.php PHP 8.1.27 (Linux) File Line Function /inc/functions.php 4950 errorHandler->error /global.php 837 build_theme_select /printthread.php 16 require_once Warning [2] Undefined array key "showimages" - Line: 174 - File: printthread.php PHP 8.1.27 (Linux) File Line Function /printthread.php 174 errorHandler->error Warning [2] Undefined array key "showvideos" - Line: 179 - File: printthread.php PHP 8.1.27 (Linux) File Line Function /printthread.php 179 errorHandler->error Warning [2] Undefined variable $css_align - Line: 1147 - File: inc/class_parser.php PHP 8.1.27 (Linux) File Line Function /inc/class_parser.php 1147 errorHandler->error /inc/class_parser.php 1174 postParser->mycode_parse_img [PHP]   postParser->mycode_parse_img_callback2 /inc/class_parser.php 481 preg_replace_callback /inc/class_parser.php 177 postParser->parse_mycode /printthread.php 184 postParser->parse_message Warning [2] Undefined array key "fragment" - Line: 1325 - File: inc/class_parser.php PHP 8.1.27 (Linux) File Line Function /inc/class_parser.php 1325 errorHandler->error /inc/class_parser.php 1417 postParser->mycode_parse_video [PHP]   postParser->mycode_parse_video_callback /inc/class_parser.php 496 preg_replace_callback /inc/class_parser.php 177 postParser->parse_mycode /printthread.php 184 postParser->parse_message Warning [2] Undefined array key 0 - Line: 1380 - File: inc/class_parser.php PHP 8.1.27 (Linux) File Line Function /inc/class_parser.php 1380 errorHandler->error /inc/class_parser.php 1417 postParser->mycode_parse_video [PHP]   postParser->mycode_parse_video_callback /inc/class_parser.php 496 preg_replace_callback /inc/class_parser.php 177 postParser->parse_mycode /printthread.php 184 postParser->parse_message Warning [2] Undefined array key "showimages" - Line: 174 - File: printthread.php PHP 8.1.27 (Linux) File Line Function /printthread.php 174 errorHandler->error Warning [2] Undefined array key "showvideos" - Line: 179 - File: printthread.php PHP 8.1.27 (Linux) File Line Function /printthread.php 179 errorHandler->error

transportation in a space colony - Printable Version +- High Frontier Forums (http://highfrontier.com/forum) +-- Forum: General (http://highfrontier.com/forum/forumdisplay.php?fid=1) +--- Forum: Real Space (http://highfrontier.com/forum/forumdisplay.php?fid=16) +--- Thread: transportation in a space colony (/showthread.php?tid=163)

transportation in a space colony - JoeStrout - 09-06-2016 I've been pondering transportation recently.  Even a small colony, say a radius of 250 m, is about 1.5 km around.  People walk about 5 kph, so that's 9 or 10 minutes to walk from one side to the other. That's not awful, but I can easily imagine being in more of a hurry than that. But it's short enough that something like a train doesn't seem to make much sense.  If you have to wait 5-10 minutes for the train, it'd often be faster to just walk. I looked into moving sidewalks, but most of these today only go about 3 kph, i.e. slower than walking.  Of course if you walk on them, then you're going about 50% faster.  That gets you to the other side in about 6 minutes, which isn't bad, but of course you have to walk to/from the walkway endpoints, so it probably ends up being about a wash. In the Toronto airport, they have a cool high-tech moving walkway that actually accelerates at the beginning, and decelerates at the end, by expanding the tiles. The speed is about 2 kph at the ends, and 7 kph in the middle.  If you walked on it, that'd get you up to 13 kph, which gets you to the other side in about 4 minutes.  Pretty good!  But very complex, and you still have to get to/from the endpoints. At this point, I mentioned all this to my older son, who said: Why not just ride a bike? Duh.  Average bicycle speed is 15.5 kph, and that gets you to the other side of the habitat in 3 minutes flat.  Assuming frequent bike racks, you can take your bike right from wherever you are to wherever you're going; no waiting, and no going to special on/off points.  Easy peasy. Not as young as you used to be?  No problem; you could use an electric bike, or take a bike taxi. Of course there are other personal transport vehicles these days: Segway (20 kph), so-called hoverboards (~12 kph), etc.  Probably space settlers will use all of these (and others we haven't thought of). But the good old-fashioned bike is hard to beat. RE: transportation in a space colony - Pye-rate - 09-07-2016 Pedal power to the future!