NEW ORLEANS (AP) - Louisiana motorists, except for those in three New Orleans area municipalities, now have the option of getting their vehicles inspected every two years instead of annually. The new law took effect Saturday. Drivers can buy a one- or two-year safety inspection sticker. The annual sticker costs $10; the two-year version costs $20. But drivers in New Orleans, Kenner and Westwego will not have that option. They will have to get an annual inspection and a yearly tag. Officials said the three cities' inspection programs pre-dated the state program. If the cities want to give the drivers the two-year option, officials said each city will have to amend existing local ordinances.