Britain’s roads
I’d miss the roads the most. They’re not very important, but just how well-thought-out the road system is in Redmond (but not Seattle) makes me grow frustrated with the single-lane, arbitrary squiggles of Britain’s roads.
Britain’s roads aren't arbitrary but may look so to someone that hasn't studied the history. 95% of the British roads existed before the advent of the motor car so obviously weren't "designed" for them. I've put the word designed in quotation marks because the roads and their unsurfaced ancestors simply took the path of least resistance - Roman roads aside - so that pedestrians, drovers and other traders didn't have to deal with gradients, rivers and so on.
You see a squiggle, I see a route around a big tree that didn't warrant being hacked down to save ten seconds of walking.