they are seeing. we will have more coverage of nelson mandela's legacy still to come on "early start." we are following the vast majority of the united states dealing with the effects of a deep freeze, including major travel headaches. more than 500 flights have been precanceled. so bad they are canceling them before they are supposed to take off! they have been canceled around the country because of the bitter weather. >> getting around by car not easier. icy conditions call that seven vehicle wreck along interstate 540 in northern arkansas. four people tenth so the hospital and we are told their injuries are not life-threatening. most roads in the entire state of oklahoma are considered slick and hazardous this morning. a state of emergency has been declared in all 77 counties. state has activated emergency operation center to help people affected by the bad weather. at least three dozen people have been injured there. bad in denver too. the drivers there having to exercise a whole lot of patience. the city is dealing with packed snow and ice on the roadways.