[{"data":1,"prerenderedAt":344},["ShallowReactive",2],{"project-12782881":3},{"id":4,"name":5,"line":6,"line_source":7,"title":8,"url":9,"domain":10,"maker":11,"posted_at":12,"year":13,"points":14,"comments":15,"rank_in_year":16,"shown_in_year":17,"top":18,"tier":19,"category":20,"subcategory":21,"format":22,"keywords":23,"reception":28,"sentiment":29,"stance_mix":30,"scored_comments":35,"aspects":36,"strip":44,"post_text":45,"what":46,"said":70,"maker_in_thread":182,"shape":185,"grid":190,"attempts":305,"same_week":306,"maker_shows":33,"maker_hidden":336,"reader_version":337,"card":338},"12782881","Simple Highway Simulator","A Simple Highway Simulator","title","Show HN: A Simple Highway Simulator","http:\u002F\u002Fmuehlemann.com\u002Fhighwaysim","muehlemann.com","Silvanm",1477343056,2016,219,44,117,2264,6,"notable","learning_science","traffic simulation","web_app",[24,25,26,27],"traffic simulator","highway traffic","traffic jams","driving simulation","mixed",0.181,{"positive":31,"neutral":32,"mixed":33,"critical":34},8,11,1,5,25,{"performance":37,"idea":40,"design":42,"execution":43},{"positive":38,"critical":39},2,3,{"positive":18,"critical":41},0,{"positive":41,"critical":41},{"positive":41,"critical":38},[34,33,33,34,39,39,41,41,41,41,41,41,39,39,41,39,41,34,39,33,39,34,41,41,39,34,41,39,39,39,39,41,41,33,41,41,41,34,34,39],null,{"problem":47,"audience":45,"pricing":45,"motivation":62,"time_to_build":45,"stack":67,"openness":68,"stage":68,"team_size":69},{"value":48,"source":49,"evidence":50},"Shows how traffic jams form and spread under different driver settings","inferred",[51,55,59],{"id":52,"by":53,"text":54},"12786012","cyberferret","Interesting project! I had fun playing with it. I wanted to test the theory (which I saw in an article posted here on HN a few weeks ago) that a single car slowing right down on…",{"id":56,"by":57,"text":58},"12784656","jtolmar","Here's something fun and counter-intuitive: From default settings, set speed variance to 50%, launch frequency to 120 cars\u002Fminute, and reaction time to 500ms. Unsurprisingly,…",{"id":60,"by":11,"text":61},"12791596","Glad to see my first post on HN to receive such positive feedback. I guess I'll post my vacation projects regularly if they are appreciated :-) If you want to see a more…",{"value":63,"source":64,"evidence":65},"Maker's vacation project","maker",[66],{"id":60,"by":11,"text":61},[],"unknown","solo",{"praise":71,"objections":97,"requests":129,"questions":164,"alternatives":170},[72,82],{"value":73,"source":74,"evidence":75},"Fun to play with and shows traffic dynamics","commenter",[76,77,81],{"id":52,"by":53,"text":54},{"id":78,"by":79,"text":80},"12783337","lucb1e","Some bugs (cars not always breaking when another is standing still ahead; cars crashing at the beginning if you hit launch too quickly), but overall a fun toy to play with. I…",{"id":56,"by":57,"text":58},{"value":83,"source":74,"evidence":84},"Possible uses for queues, traffic agencies and education",[85,89,93],{"id":86,"by":87,"text":88},"12783803","zoom6628","Its principles also hold up for drivers in China. Guess the chinese love copying american things right down to driving just as badly :-D Anyway, jokes aside, this has a lot more…",{"id":90,"by":91,"text":92},"12793316","hacker314159","Really cool project. I wonder if transportation agencies would want to use something like this for studying traffic.",{"id":94,"by":95,"text":96},"12786001","mpnordland","Simple Highway Collision Simulator. Could be a great little game with an educational bent. Personally I set reaction time to 0 and jacked everything else to max. Then I spammed…",[98,106,117],{"value":99,"source":74,"evidence":100},"Reaction time default of 200ms is unrealistically fast",[101,105],{"id":102,"by":103,"text":104},"12786694","mabcat","The 200ms default reaction time in the simulation is wildly optimistic. I remember 1500ms from rider training and http:\u002F\u002Fwww.visualexpert.com\u002FResources\u002Freactiontime.html seems to…",{"id":78,"by":79,"text":80},{"value":107,"source":74,"evidence":108},"Braking and acceleration model is unrealistic",[109,113],{"id":110,"by":111,"text":112},"12787578","novaleaf","also braking: it looks like the cars can only brake as fast as they accelerate. seems like this should be a different slider.",{"id":114,"by":115,"text":116},"12784367","maxerickson","Lots of cars do 15 km\u002Fh\u002Fs (that's a 0-60 mph time of ~6 seconds). A basic Honda Civic will be around 9 or 10 seconds, which is roughly 10 km\u002Fh\u002Fs. 5 km\u002Fh\u002Fs would feel pretty…",{"value":118,"source":74,"evidence":119},"Bugs such as crashes when launching cars quickly",[120,121,125],{"id":78,"by":79,"text":80},{"id":122,"by":123,"text":124},"12784487","cpeterso","If you launch new cars too quickly, they start blowing up. :)",{"id":126,"by":127,"text":128},"12794761","netsharc","This might depend on your screen size, on my screen the crashes occur on the right edge of the road.",[130,149,157],{"value":131,"source":74,"evidence":132},"Add lane discipline and left or right lane preference",[133,137,141,145],{"id":134,"by":135,"text":136},"12786387","scotty79","What I'm missing is right lane preference, that would control how much people obey the rule that you shouldn't be on the leftmost lane unless you are faster then the cars in the…",{"id":138,"by":139,"text":140},"12788270","tragomaskhalos","Or indeed left-lane preference, for British and Japanese users. But yes a more sophisticated simulation would use > 2 lanes, and have various controls for lane discipline,…",{"id":142,"by":143,"text":144},"12784015","shocks","It'd be interesting to implement lane discipline and see how one bad driver effects the rest.",{"id":146,"by":147,"text":148},"12784202","ajmurmann","Yes, please! I suspect lack of lane discipline to be the single biggest disadvantage US freeways have to American's. I would love to test that at least via simulation. I would…",{"value":150,"source":74,"evidence":151},"Add merges, ramps and more than two lanes",[152,156],{"id":153,"by":154,"text":155},"12785980","buzzybee","Something this sim doesn't model that plays a large role in real accidents is the speed differentials during merges. If an offramp moves too slowly and gets fully congested, it…",{"id":138,"by":139,"text":140},{"value":158,"source":74,"evidence":159},"Carpool lane modelling",[160],{"id":161,"by":162,"text":163},"12784801","legohead","Nice. I've wanted to do something like this, as I have a theory about the car pool lanes being worse for traffic. When traffic is bad, car pool lanes are just as backed up…",[165],{"value":166,"source":74,"evidence":167},"What are realistic reaction time and acceleration values?",[168,169],{"id":78,"by":79,"text":80},{"id":114,"by":115,"text":116},[171,175],{"value":172,"source":64,"evidence":173},"traffic-simulation.de",[174],{"id":60,"by":11,"text":61},{"value":176,"source":74,"evidence":177},"trafficwaves.org traffic hobbyist site",[178],{"id":179,"by":180,"text":181},"12787197","mwexler","No post on traffic is complete without a reference to the original \"traffic hobbyist\": http:\u002F\u002Ftrafficwaves.org\u002F from Jan 1998.",{"comments":33,"answered":41,"key":183},[184],{"id":60,"text":61},{"commenters":186,"max_depth":187,"maker_replies":33,"first_comment_mins":188,"lifespan_hours":189},40,4,63,35,[191,193,195,196,200,202,204,208,211,215,218,221,224,227,229,233,235,236,239,240,241,244,247,249,250,254,256,259,262,265,269,270,271,274,276,278,281,286,289,293,295,297,299,301],[52,41,34,192,53,41],"project\u002Fpositive\u002Fperformance",[102,41,33,194,103,41],"project\u002Fcritical\u002Fperformance",[110,41,33,194,111,41],[197,33,34,198,199,41],"12783388","project\u002Fpositive\u002Fidea","puddintane",[134,38,39,201,135,41],"project\u002Fneutral\u002Fdesign",[138,38,39,203,139,41],"project\u002Fneutral\u002Fidea",[205,39,41,206,207,41],"12783635","other\u002Fneutral\u002Fnone","erentz",[209,39,41,206,210,41],"12783915","gerdesj",[212,39,41,213,214,41],"12786115","commenter\u002Fneutral\u002Fnone","eb0la",[216,39,41,213,217,41],"12787062","julianwachholz",[219,39,41,206,220,41],"12784328","jeron",[222,39,41,206,223,41],"12785364","holierthenthou",[225,39,41,206,226,41],"12784423","foota",[78,187,39,228,79,41],"project\u002Fmixed\u002Fexecution",[230,187,39,231,232,41],"12783523","project\u002Fneutral\u002Fperformance","zodPod",[234,187,41,213,79,41],"12784253",[114,187,39,231,115,41],[237,187,41,213,238,41],"12786914","anentropic",[56,34,34,192,57,41],[153,34,39,203,154,41],[242,34,41,206,243,41],"12786110","mjevans",[245,34,33,194,246,41],"12786335","Bdiem",[126,34,39,248,127,41],"project\u002Fneutral\u002Fexecution",[86,18,34,198,87,41],[251,252,41,206,253,41],"12783564",7,"striking",[255,252,41,206,210,41],"12783951",[257,31,39,231,258,41],"12784339","fatdog",[260,261,34,198,232,41],"12783532",9,[263,261,41,213,264,41],"12783681","catshirt",[266,267,39,248,268,41],"12784381",10,"robmiller",[142,32,39,203,143,41],[146,32,39,203,147,41],[272,32,41,213,273,41],"12784555","JadeNB",[161,275,39,203,162,41],12,[277,275,41,206,243,41],"12786143",[279,275,41,213,280,41],"12793137","tbihl",[282,283,33,284,285,41],"12784839",13,"project\u002Fcritical\u002Fexecution","paulsutter",[60,287,41,288,11,33],14,"maker\u002Fpositive\u002Fnone",[290,291,41,206,292,41],"12783363",15,"nercht12",[179,294,41,206,180,41],16,[94,296,34,198,95,41],17,[90,298,34,198,91,41],18,[122,300,33,284,123,41],19,[302,303,34,198,304,41],"12783387",20,"sparky_",[],[307,312,317,322,327,331],{"id":308,"name":309,"points":310,"category":311},"12786935","LiquidTime",301,"productivity",{"id":313,"name":314,"points":315,"category":316},"12762611","Quiet",179,"languages",{"id":318,"name":319,"points":320,"category":321},"12752125","hnlive.tk",109,"data",{"id":323,"name":324,"points":325,"category":326},"12751595","Nuage",79,"web_saas",{"id":328,"name":329,"points":330,"category":20},"12795711","Modular JavaScript",73,{"id":332,"name":333,"points":334,"category":335},"12780220","Mediachain Attribution Engine",64,"ai",false,"v2",{"id":339,"name":5,"line":6,"ai":336,"cat":20,"year":13,"points":14,"comments":15,"rec":28,"s":340,"top":18,"kw":341,"maker":11,"domain":10,"tier":19,"attempts":41,"strip":342,"url":9,"mix":343,"praise":73,"objection":99,"sub":21},12782881,0.18,[24,25,26,27],"5115330000003303053135003503333001000553",[31,32,33,34],1794036548842]