Gasoline prices are still on the rise across the country. 

The average price is more than four dollars a gallon in some parts of the country. 

Triple A says the national average hit three-57 this week. 

That's up from the three-17 motorists were paying a year ago.  We may not have seen the worst yet. 

Some experts are predicting five-dollar gas by the time Memorial Day rolls around due to rising tensions over Iran and continuing increases in oil prices.