We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.
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第五十二条 禁止将放射性废物和被放射性污染的物品输入中华人民共和国境内或者经中华人民共和国境内转移，法律、行政法规另有规定的除外。。业内人士推荐同城约会作为进阶阅读
What if you create a truly unique routing profile that's wildly different from the common ones for which shortcuts were pre-calculated? The system is smart. If it detects that too many shortcuts (~50, for example) need on-the-fly recalculation and deviate significantly, it might determine that falling back to the original, comprehensive A* algorithm for the entire route would actually be faster than doing many small, heavily modified A* calculations.