The small size of the The Boring Company's tunnels seems perfect for bicycles.

https://www.cnn.com/travel/article/worlds-longest-cycling-tu...

As a bicyclist, it might make sense, but not commonly. In rural or undeveloped areas, it's cheaper to just pave a bike path aboveground. In dense and developed areas, the sheer number of potential destinations means you'd need an unreasonable high number of points from which to emerge from the tunnel; better to just build protected bike lanes where bicyclists can transition to ordinary sidewalk-borne pedestrians by merely stepping off their bike. The only tunnel solution that makes sense would be a "highway" through a dense area with only few onramps/offramps, but that implies that you have a very high amount of urban density such that bike trips (which are usually under five miles) can't just be done using dedicated above-ground protected bike lanes. Or hell, an actual subway.

Maybe not bikes but small electric vehicles such as golf carts would be great. Most wouldn't want to go to work all sweaty.

It amazes me that a lot of these green cities haven't incorporated a small golf cart lanes as most people work within a range of a golf cart distance to travel.

The cost would be a lot cheaper than a car, no need for insurance premiums(if so, very little) , and less maintenance than . Also could likely double the lane traffic within the equivalent car lanes. The consumer would be more than willing to get on board using and buying golf carts just for the financial benefit of it.

Isn't this the selling point of Bird/Lime/Citibike etc... personal mobility? With e-mobility you don't arrive all sweaty.

Golf carts can provide rain and sun protection and can also allow for people to drive their kids to school and other activities as well.

Not saying that ebikes are bad but it would also be more appealing for the masses to embrace golf carts over bikes as a replacement for their vehicles.

But it's only good if you are going from one end of the tunnel to the other. You are cut off from all of the destinations in between. This is fine if you're talking about a tunnel that goes across a highway or something, but not great if you're bypassing all of downtown. I'd much rather see cars and trucks underground and bikes on the surface.

One could imagine a city where the streets are only for bikes/pedestrians/scooters/etc... and deliveries happen via underground tunnels where there is parking every other block and a freight elevator to bring the goods to the surface. A kind of futurist ideal that will never work because it would be horrendously expensive and the elevators would always be breaking down and as the city grew the system would be trapped at its current size and become increasingly overloaded over time.

Safety rules require exits every 300m, which is about 1 a block. That sounds about right for a bicycle expressway.

It is a much bigger ask to have an above ground station entrance on every block.

Separated bike lanes at street level or bust. Digging tunnels underground for bikes to get around is pants-on-head backwards- like we're trying to find the most expensive and circuitous solution to a problem we already know the answer to.