Lola,
I have mentioned that route taxis can be chartered, but lets face it, if you charter a route taxi, that is one less route taxi to server the Jamaican people. My recommondation would to use one of the charter taxis available all over Negril.
As for the vehicle count, if you count the only West End route taxis and the charter taxis, they both equaled 5. So the count is the same. The problem comes in with the number of non-West End route taxis driving off their route. Had they not been driving, the number of charter taxis may have been higher. We will never know the actual numbers because of the supply/demand issues that happen during busy season. When route taxis drive routes other than their own - it must skew the results.