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一种会害死骑行者的路口设计
A Type of Road Junction that Kills Cyclists
2018 — 2020，它一次次回到首页
黑点是上首页（≥ 50 分）的那次投稿，空心点是没冲上去的投稿，点越大分数越高。
导读
这篇文章分析英国一种乡村主路与侧路交汇的路口设计：司机因视线盲区、道路几何和车辆A柱遮挡，看不见沿主路骑行的自行车，导致同类致命碰撞反复发生。文章结合具体事故追问，为什么这种路口会持续杀人，以及让行标志、法律和道路改造为何没能阻止悲剧。
为什么经久不衰：它把看似偶发的交通事故还原成可复现的道路设计缺陷，关于盲区、混行和路口几何的讨论今天仍有现实意义。
HN 评论精选
认为街景显示地形遮挡才是关键，应先设Stop/四向停并严惩冲路口，而不是只靠几何改造。
文章里有很多关于盲区和汽车A柱的数学，但谷歌街景似乎显示，接近路口时地形和灌木挡住了视线，使这些计算基本无关紧要。涉事司机接近路口时甚至不减速，这已不只是鲁莽，后续还有别的违法行为。“Give Way”标志很愚蠢，应该在另一条更平坦的路上设Stop标志，或改成四向停车。造成事故的司机直接冲过路口，法律措辞竟让他们逃避更严厉惩罚，真可耻。改道路几何（如文章所建议，或更激进地建环岛）在这条乡村路上是蛮力方案，但在其他社会措施不足时也许必要；不过在挖路之前，显然还有很多其他改变可做。
temp-dude-87844查看英文原文
There's a lot of math in this article about blind spots and car pillars and whatnot, but a Google Maps Street View appears to show the terrain and brush blocking the view on approach [1][2], making all of this math largely moot. That the drivers in question didn't even so much as slow down for this approach is beyond reckless, aside from the other lawbreaking that followed. The 'Give Way' sign is idiotic, put a Stop sign on the other, flatter road, or make it a 4-way stop. The drivers causing accidents were blowing through the intersection, and shame on the wording of the law that they were able to weasel out of harsher punishment. Altering the roadway geometry, either as proposed, or more drastically with a roundabout, is a brute-force solution on this country road when other societal measures don't suffice, but it seems that there's plenty of room to enact other changes before you dig up the road. [1] https://www.google.com/maps/@50.8638239,-1.4511249,3a,75y,269.62h,66.23t/data=!3m6!1e1!3m4!1sgp5ZPCZzLXnphyQnR_xhww!2e0!7i13312!8i6656 [2] https://www.google.com/maps/@50.8634141,-1.452595,3a,75y,269.9h,68.29t/data=!3m6!1e1!3m4!1sZFSqQto6dDxulLvfKmzH6g!2e0!7i13312!8i6656
主张高速乡村路应让自行车与机动车分离，并配合信号、警示和减速设计，同时加强司机培训。
我觉得很多评论者只关注标志能做什么、该建哪种路口，而没有关注一个事实：在高速乡村主干道上，自行车不该和汽车混行。丹麦许多乡村高速路（当然不包括高速公路）旁边设有分离的双向自行车道，它们靠近但不紧贴机动车道。这样骑行者可以自行穿越侧路，更容易被看见，并与侧路形成自己的交叉口；还可以设置仅在有骑行者过街时对汽车亮红灯的按钮信号灯。此外，可设置提醒司机注意路口骑行者的标志，并在路口前加设减速弯，让司机不必靠停车标志也降速。我也认为英国司机对如何处理自行车、以及自行车也是道路使用者这一点训练不足。
Svip查看英文原文
I feel a lot of commenters are simply focusing on what signs can do or what sort of junction to build, rather than focus on the fact that on high speed primary country roads, bicycles shouldn't be sharing the road with the cars. In Denmark, a lot of high speed roads (excluding motorways, of course) out in the country have separate dual-way bicycle lanes near it but not attached to it. (Example: https://i.imgur.com/dS6jqXS.jpg) That way, the cyclists can cross the side roads on their own accord, where they are more visible and have their own junction with the side road. Additional, one can set up a traffic light that only turns red for the cars when a cyclist is crossing (i.e. activated by a button). Furthermore, one might consider signage that warns drivers about cyclists in the junction: https://i.imgur.com/CX6SJdW.jpg Also, a way to reduce speed of the motorists without putting in stop signs would be to add chicanes just before the junction, so they are forced to slow down. Plus, as I've mentioned before (see https://news.ycombinator.com/item?id=15977162), I also think it is because UK drivers don't really have enough training with how to deal with bicycles and the fact that they are also participants on the road.
荷兰共享空间路口通过取消规则和直线路径制造不确定感，迫使司机减速，事故归零。
荷兰乡村这种“共享空间”路口是个有趣方案。这里在2009年实施前发生过多起严重事故，之后没有。注意道路旁有独立自行车道，但那是标准配置。这里没有标志、没有规则，但道路不能再直线穿过，而且强烈暗示这是行人区域。司机被搞糊涂，这反而抓住他们注意力并让他们减速。
Scarblac查看英文原文
This type of "Shared Space" junction in a rural area in the Netherlands is an interesting solution: https://www.google.com/maps/@53.093333,6.2410165,255a,35y,328.48h,44.92t/data=!3m1!1e3 Several bad accidents happened here before this was implemented, none since 2009 when it was. Note that there are distinct paths for bicycles next to the roads, but that's standard. There are no signs, no rules, but the roads can't be taken in a straight line anymore and it's certainly suggested that the junction is a pedestrian area. Drivers get confused which grabs their attention and makes them slow down.
英国Stop标志罕见，司机习惯让行，盲区下会误以为自己已让行。
还要补充：英国的Stop标志相比美国等地非常少见。人们不会预期这种路口有Stop标志，所以他们预期是让行，而由于盲区，他们以为自己已经在让行。
chrisseaton查看英文原文
Something to add to this is that 'stop' signs are pretty rare in the UK compared to somewhere like the US. People wouldn't be expecting a 'stop' sign at a junction like this, so they're expecting to yield, and due to the blind spot they think they are yielding.
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