Ask the Experts / Realistic go karts tracks - How is it done?

And I'm talking about tracks like for example this one in alex's NEDC4 entry. How is this done?

Two ways as far as I know: 

1) Build your go kart track, hide it using the tile inspector/different ride mode, build your scenery and make it look like a go kart track.

2) You can merge go kart track just like any other track, so merge straight portions onto roller coaster track that has larger radii. Just be forewarned that the karts don't race on any track that's not go kart track. Then hide all the track and follow the steps in 1).

EDIT: After looking at the go karts in the junkyard, I can confirm Alex somewhat did 2). You can see the carts "jumping" to the single rollercoaster track around the wider corners. If you play around with the ride type and change it to junior coaster, you can see he didn't even bother with merging at all, its just one track.

Just built a coaster, and change the train type, operating mode and track type (crooked house is fine).

Do not use diagonals, not just because of the crooked house if you care about compatibility, but also because it go karts do not behave well on diagonals. That includes wide turns.

Whenever I made go-karts I change the track type to enterprise, that way it has good ratings and is invisible.

Here's a shot of my karts in Six Flags Carolina under construction.  

I wanted a station/pit area that was not on the main track loop, like most kart areas are here in the US.  In order to prevent accidental merging, I used banking across the various track-- the color is just to differentiate while I'm looking at it.  So rather than laps, it's just one long loop that returns back to the pit area.  This was before Open, so the go kart track is merged in there maximize the amount of vehicles I had on course.

One issue I did have was occasionally one car would get way ahead of the rest and lap them at which point they'd sometimes get stuck when the invisible tracks crossed.  I saw this as a minor issue so I didn't address it.  If you open SFC and let it run, the karts will crash, however.  I think this comes down to a merging issue, but never bothered to investigate.  

As far as I can tell, 4 laps is the most you can get on a 2 wide track.

Hope that helps!

 karts.PNG (968.35KB)
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I bet you could theoretically fit 8 or more depending on the particular layout.