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Comment by dm2 | Hacker News Reader

Are you saying that the UK has a grid pattern and wider streets? I had always heard that the UK had narrow streets in many places, but that's just from watching Top Gear.

Here is a Google autonomous vehicle navigating Lombard Street in San Francisco: http://youtu.be/eXeUu_Y6WOw?t=1m34s

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No he's saying the opposite. The UK does have a lot of narrow bending rounds and tiny country lanes :)

That's what I assumed but did a quick Google Maps search and it appears to be mostly a grid at first glance, unclear wording, "The UK's roads are quite a different test bed to many West coast US cities where there is no grid pattern, roads are smaller, and curvey."

Where were you looking at, Milton Keynes? Peterborough? I'm struggling to think of anywhere gridlike in the UK, though I'm sure some of the '60s towns have them.

Around Liverpool and Birkenhead were the only places I looked, they're not perfect grids of course, I don't know hardly anything about European street layouts though, that might be considered very gridlike compared to other places in the area.

Glasgow is gridlike; I was there for the Games and it felt like a very un-British street layout. But I don't think anywhere in the UK has grid numbering ("42nd street" etc). We don't do the continental thing of naming streets after significant dates either.

The UK certainly has plenty of surprising road layout, often involving roundabouts, oneway systems, medieval street plans, and roadworks.

I was gonna say that Glasgow city centre is pretty atypical - resembling US cities close enough that a few parts of World War Z (which were meant to be Philadelphia I think) were filmed there. But then I realised that Edinburgh's "New Town" (actually hundreds of years old) is a grid-layout too.

New Town in Edinburgh and the modern city centre of Glasgow both date back to the mid-18th century. They're very unusual for the time insofar as they had a large plan for a large area.

Salisbury had a grid pattern back in the 13th century. But mostly small roads follow old field boundaries that can be very old and bendy. Even new developments will fit into old field layouts and have curved roads.

>* But mostly small roads follow old field boundaries that can be very old and bendy.* //

The places I know of - Lincolnshire and East Lothian - where roads follow field boundaries have a lot of straight roads with 90deg bends. Interesting you suggest that field boundary following would make roads more "bendy" (suggesting non-straight edges and non right-angles).

Perhaps the fields of Salisbury weren't dissected for inheritance purposes or are older and follow more natural lines?

It depends how old the field is. Around villages you can see very irregular fields that are very old. But a lot of the larger fields have straighter boundaries as a result of intentional enclosure. In lowlying parts a lot of the land is drained, and smaller drainage channels will follow straight lines.

Take a look at London - basically the kind of road layout you'd get if you threw a bunch of toothpicks on the floor and used those as the guidelines for random branching.

This isn't an uncommon view once you get off the motorway and drive to towns: https://www.google.co.uk/maps/@51.366804,-2.602688,3a,75y,24...

Two wide cars can't pass there, one of you has to go back to a place without the hedge. I'd like to see how that kind of negotiation is handled by self-driving cars.

That is the main road to Bristol Airport from where I used to live in south Somerset :)

Yes it is, that's why I knew where to look ;) (currently based in Bath)

Not too far away is Bath. Here's a road https://www.google.co.uk/maps/@51.383309,-2.361499,3a,75y,96...

(I wonder if you can tell any of the digits of someone's ATM card by their hand positioning?)

I love the idea of self driving cars and they should make roads like that a bit safer.

Not counting driving on the wrong side of the roads. I wonder if google cars' AI only needs a "Drive on the wrong side of the road in this country" command, or if some more complex programming is needed.

If you look at Google Maps (at least on the desktop,) there's usually directional indicators on odd roads and in any directions in the UK you'll notice how the blue line goes clockwise around roundabouts instead of counter-clockwise like our friends in the rest of the world

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