None of the above choices .Since it was not deep it melted .Because the cars with chains driving on them all day cut up all the snow and ice causing it to melt .Because it was windpacked and smooth during the storm .
Why were the roads infinitely better that night ?
The snow was nt deep ( it had been windpacked from the 50kph winds during the storm ) , but it was smooth and fun . A great improvement over the previous weekend . That night we went back to ChCh with the roads being infinitely better . We suspect it was all the cars with chains that cut the ice up so it eventually melted .