Twister wrote:
If there are 10 stops spaced 1 mile apart, with 4 passengers boarding the bus at each stop, and all passengers remaining on the bus to the end of the route, then the first 4 passengers each cover 10 miles, the next 4 each cover 9 miles, and so on. If each of those passengers chose to drive themselves into the city, the total mileage covered by their 40 cars would be 220 miles. Yes, compared to the average mileage covered by an individual passenger, the 20 mile round trip by that one bus looks bad, but compared to the total mileage being saved, it looks bloody good!
That's 11 times the distance.
In terms of fuel consumption, the bus might use a bit less fuel but there's probably not a lot in it. What's the fuel consumption of a bus compared to a car in urban conditions?
And when it comes to pollution the cars win hands down - a bus produces around 35 times as much NOx and around 100 times as much (carcinogenic) particulates per mile as a car does. So buses produce far moe harmful pollution than the cars they replace.
In terms of congestion, well firstly we'd need a hell of a lot more buses than we have before we start making a dent in the number of cars on the road. Secondly, a single lane of a single road can carry up to about 2000 cars per hour in free-flow conditions. But they turn it into a bus lane, which carries, perhaps, 10 buses per hour.
In terms of journey time, the cars win hands down - and this isn't down to congestion. A bus often stops at a bus stop for several minutes at a time, and is not as manoeuvreable as a car. Ever seen a bus trying to negotiate a junction in a narrow street?
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No, only those people getting on the bus at the first stop will need to be onboard by 8:30, those people boarding closer to the city will have a shorter journey time and thus can board the bus later.
If you want to get pedantic, then yes

But you do get the gist of it - it's only a hypothetical example, after all.
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If a route is so unlikely to attract any passengers during the daytime, then it'll be more likely that those six buses are working on different routes, or the drivers who worked the morning shifts have gone home and the evening shifts are worked by different drivers. Yes, there will always be a few buses going spare during the day, and yes, there will always be a few drivers sitting around being paid to do nothing. But this is only so that, if a bus breaks down or a driver calls in sick, there'll be a spare bus/driver to cover the shift.
True.
However, if we multiply the number of buses in a vain attempt to get cars off the roads, it'll be a different story.
Regards
Peter