[_hcuq]

So…… 25 sq miles. Let’s assume a 5 mile x 5 mile grid. Let’s put a bus route every half mile. That’s 20 bus routes. Let’s run a bus on each route every 15 minutes…. The buses run at an average speed of say 20 mph. So each bus takes 20 minutes to traverse the route in one direction. You would need 2 buses per route. That’s 40 buses. Let’s say it costs $100 per hour to run the bus. (Googled it). So that’s $4000/hr to run the entire system. Let’s run the system 16 hours a day. 4000 * 16 = $64000 per day. $23 million dollars a year. The 51,000 population would have 17,000 cars. 17,000 * $5000 = $85 million. So it would be much cheaper to have a bus system….

[mwint]

Where'd this $5000/car(/yr?) number come from? Total cost of ownership for a car is far less than that. You can only really get to $5k/year through very high depreciation, and people buying those kinds of cars won't be riding your busses anyway.

Also, $100/hr to run a bus is probably a fine operating cost number, but you do have to buy the bus (capitalized cost) and take the depreciation hit just like cars.

[_hcuq]

The total cost of ownership includes gasoline, repairs, insurance, road tax as well as depreciation. The $100 per hour includes the cost of buying the bus.

[Karrot_Kream]

Look at [1] and you see it's the average across the US. It's more expensive than that in many states. Unless you're discounting the purchase price/monthly loan payment/lease price.

[1]: https://www.move.org/average-cost-owning-a-car/#data

[mwint]

Key word there is probably average. Median would be more interesting.

[Karrot_Kream]

New Mexico is sitting at the median (spot 25, so not quite, need to average out the two middles) at $5,063.78.

[mwint]

The median of a list of averages is not the median of the population.

[Gordonjcp]

I don't think I've paid (the equivalent of) $5000 for every car I've ever owned, in total.

[cozos]

This analysis reeks of confirmation bias. You don't need one personal car for every 3 people if you were to comparing busses with self driving cars. You would have a fleet, just like you do with busses. Here is something posted a couple days ago:

https://www.npr.org/2022/07/19/1111765630/on-demand-shuttles...

15 minivans replaced 6 busses, at a cost of 1.6 million to 1.3 million per year - but with much better coverage than the busses.

Of course this equation will look very different in big cities where economies of scale from mass transit kick in， but hey, small cities need transit too.

[_hcuq]

There are no self driving cars … why would I compare buses to them?

But the minivan link was interesting.

[Karrot_Kream]

Fleets of cars would require additional infrastructure being built (specialized parking structures, staging areas, etc) so would increase costs. At this point we're also talking about the theoretical extension (fleets) of a theoretical concept (self-driving cars) so basing this execution in reality seems fraught.