No, I didn't, nor distance, but it's a good point. I'd like to hear how people go about solving these problems. I once knew a computer scientist working for a

No, I didn't, nor distance, but it's a good point. I'd like to hear how people go about solving these problems. I once knew a computer scientist working for a city council, she spent her days simulating the effects of changes to transport infrastructure. It was quite enlightening to hear that adding a bus stop could have a knock-on effect that would cause gridlock elsewhere in the city. It was a very hard problem.