[philwelch]

Cars are pretty terrible, but horses are even worse, if you can imagine it.

Think about all the traffic problems with cars, except the street is covered ankle-deep in manure. And you can't install catalytic converters in their butts to reduce pollution, either.

[jogjayr]

No one's seriously suggesting going back to horses.

Many are advocating mass-transit or bike-friendliness.

[bomb199]

I'd like to think if our main form of transport was horses, we'd have solved this problem.

[ravitation]

We'd have invented cars... And that's what we did.

[TheSpiceIsLife]

There's a thing called manure bag which you hang from the saddle and over the horses rump to catch manure on the fly.

Image search the internet for horse manure bag for various examples.

Other problems mitigated by horses as a means of transport include, but are not limited to, the relative rarity of high speed collisions. Although, falling off a horse can be quite traumatic.

[jknoepfler]

I don't recall advocating horses. I advocate using the best means our times make available!