Triple A says gasoline prices are the highest in six years. It wasn’t supposed to be this way. The prices were supposed to drop. But instead the national price of a gallon rose to 3.68, highest price for early summer in six years. Virginia is 3.48, Richmond is 3.45. Triple A says it probably won’t affect the number of motorists on the highway this holiday weekend, but it will cost them more. The average price at the pump had increased for 12 consecutive days through last Monday, and Friday’s average was 15 cents more than a year ago.