[TXnMA]

"One must also consider that good roads are necessary to make use of carts effectively."

Yes, indeed. And these GGG posts are exactly why I mentioned the Mayan wheeled toys...

The great Maya "white road" that connected the cities of Coba and Yaxuna

...and...

Ancient Mayan Superhighways [Causeways] Found in the Guatemala Jungle ...

Why build raised causeways and a 26 foot wide, 60 mile long white plastered road, -- if you have no vehicles to take advantage of them?

I can't figger 'em out. Must've been liberals... '-)

TXnMA    
  

[Harmless Teddy Bear]

They did take advantage of them with vehicles, just not axle and wheel vehicles.

Most road building projects through out history have been to get your military from one place to another quickly. It is easier for armies to march on paved roads that are raised above the mud.

[SunkenCiv]

Uh, let's see... they had, uh, a ceremonial or ritual purpose! Yeah, that's it!