setexitslowdown

Exit setexitslowdown(Exit exit, OverlayPackage overlay, Number multiplier)
Contexts: computer function, computer program, standard futureprog
Sets the travel time multiplier on an exit overlay. Returns the edited exit or null if the exit/package is null or the package is not editable.
exit: The exit to edit or copy into the supplied overlay package.
overlay: The editable overlay package where the change should be made.
multiplier: The travel-time multiplier to apply to the exit.