Canterbury National Road users are warned to take care due to surface flooding, slips and rockfall after bad weather hit Canterbury, the West Coast and Central Otago. While the rain has eased and MetService has lifted its weather warnings, NZ Transport Agency Waka Kotahi said area warnings remain in place this morning, a spokesman advised.  In Christchurch, significant surface flooding has been reported this morning on State Highway 74/Anzac Drive, north of Wetlands Grove, and caution was  urged for those travelling on this route.   Area warnings over surface flooding remain in place at the following West Coast locations: SH7 between Reefton and Springs Junction (Rahu Saddle) SH 6/Lower Buller Gorge between Inangahua and the intersection with State Highway 67/Buller Road SH 6 between Makarora and Haast (including Haast Pass) SH 6 between Haast and Hokitika Temporary traffic lights and a 30km/h temporary speed limit reduction have also been in operation overnight on SH73, between…