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0619a6b324
The lake cost only added half again within 12 m of the bank, so the cheapest line round a bend ran one grid cell off the water's edge (7 to 19 m on the big lakes), and pulling it straight could draw it over land. A clearance ramp now makes the water nearer than 80 m (40 m along the shore) steadily dearer, which also centres the route in anything narrower than twice that, the shore style rides a band 100 to 350 m out instead of the bank itself, and a shortcut may not come nearer the shore than the path it replaces. Measured on nine lakes: no sample on land (was up to two), direct keeps 51 to 78 m at its closest (was one cell), along the shore the median is 60 to 100 m (was 30 to 40) and under 1 % of it within 25 m (was up to 22 %); lengths change by under 1 %.