From a practical perspective, if we have a waiting line problem for which the Poisson and negative exponential distributions do not apply, and we desire a reasonably accurate solution, we should

From a practical perspective, if we have a waiting line problem for which the Poisson and negative exponential distributions do not apply, and we desire a reasonably accurate solution, we should

modify the queuing equations to make them appropriate for our problem.

use the simple queuing equations even though we realize they are inappropriate

use simulation to study the problem

build a physical model and use that to study the problem