Never cross a heave. Ice may or may not be fresh on either side. Fracturing may have weakened the ice. Ice "waves" generated by driving on the water causes weak spots to buckle and crack making the integrity of the ice very sketchy.
I saw a ski do almost sink trying to drive through one.
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It is not the most intellectual of the species that survives; it is not the strongest that survives; but the species that survives is the one that is able best to adapt and adjust to the changing environment in which it finds itself. Charles Darwin
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