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Cake day: June 1st, 2023

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  • Design speed is the most important tool when it comes to managing speeds, but speed cameras are a useful tool in the toolbox to address specific problematic spots, in the very least until a design speed-based solution can be deployed, which may for economic reasons be when the road warrants resurfacing.

    In Sweden, cameras are used to specifically reduce speed in crash-prone spots, such as in intersections where drivers merge onto a higher speed road. Drivers get advance notice in the form of a sign that a speed camera will be upcoming on the road in several hundred meters, and speed limit compliance naturally follows at the point of the camera. They are effective at reducing crashes when deployed in this manner.

















  • Originally airlines preferred them over two engined planes because they were safer,

    Up until ETOPS (aka Engines Turn Or Passengers Swim) was introduced in 1986, it was not even legal to run cross-atlantic flights to and from the U.S with twin engines.

    As I understand it, point-to-point taking over from hub-and-spoke coincided with mid-size high-range airplanes like the 787. Before that, the economics of running point-to-point had trouble penciling out, since you needed fairly large aircraft to handle the distance. Hence, hub-and-spoke made sense - run small aircraft to and from hubs and then run a large long-range aircraft carrying a large amount of passengers.