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The issue is that "avoid left turns if possible" adds extra mileage and extra traffic on those streets that are used for a set of right turns; plus it's a SHOUL
by Piskvorrr 8y ago
The issue is that "avoid left turns if possible" adds extra mileage and extra traffic on those streets that are used for a set of right turns; plus it's a SHOULD, not a MUST [RFC2119] - sometimes the right-turn detour would be just too long. UPS has a slight advantage here as it has a set of points to visit, not necessarily in a given order - more routing options, as compared to an A-to-B route.