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It's hard to imagine that a high number of intersections are so bad for left turns that a three right turn detour is warranted. I've seen some left turn lanes get severely backed up during rush hour on the busiest of streets, but as a general rule I'd expect the left turn would win. I'd be curious to see more data on this.

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Depends on a lot of factors and as mentioned by ceejayoz, the routing is likely a lot more complicated than that, taking into account different trucks operating in the same areas, but I know of quite a few intersections (stop-light controlled rather than stop sign controlled) in my neighborhood where I prefer multiple rights to a left because right on red is allowed (if no oncoming traffic) and you can often make the 3 right turns much faster than waiting for the one left turn at a light.

In most situations I'd imagine the routing systems can avoid the three-right detours just as much as avoiding left turns. Another truck can likely handle the other road on its route.

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