We'll look from wide to narrow--starting with what I will call "Class A:" - multiple lanes per direction - controlled access, grade separated - intended for high speed, long distancepic.twitter.com/1ttrEAJlNS
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We'll look from wide to narrow--starting with what I will call "Class A:" - multiple lanes per direction - controlled access, grade separated - intended for high speed, long distancepic.twitter.com/1ttrEAJlNS
Next is Class B: - multiple lanes per direction - traffic lights, turning lanes, etc, to regulate access and egress - sidewalks likely when in urban environmentpic.twitter.com/AN52Sokbdu
Class C is the most narrow kind of road you'll usually find in the USA: - one lane per direction - sidewalks likely when in urban environment - medium speed, mostly local travelpic.twitter.com/wehx6pQ8gX
Class D is the most common kind you'll find in Japan, whether in cities or in the countryside. Country roads in UK are about this size too. - space for cars to pass each other, but will otherwise drive in middle of road - pedestrians walk anywhere in road except when cars passpic.twitter.com/NamrYrr6rr
Class E is the narrowest road you can fit cars on, may be one-way or off-limits to non-local trafficpic.twitter.com/sXf7VC2qX4
Finally Class F, for roads which cannot fit cars on them, but can still fit motorbikes, scooters, etcpic.twitter.com/WqvYQB4YGj
Here's an example of a narrow country road from UK--I used to live near here.pic.twitter.com/HXQsBsoMKD
What I believe to be the narrowest street in Northampton, MA--still nearly twice as wide as the one from UK in prev tweetpic.twitter.com/m3DdMP7Org
One of the narrowest streets in Boston--this one is from North End, clearly off-limits to cars (although it doesn't look much narrower than Class E; if not for the poles a car might fit here)pic.twitter.com/8zYT8YuPBr
Good roads > bad roads
Great thread
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