This is a somewhat simplified version of the Rocks Village Bridge which carries Bridge
Street over the Marrimack River in Rocks Village, Essex County, Massachusetts. This was
built circa 1883 replacing a bridge built 1795. In the real world this has a 6 ton load
limit.
I have not included any built-in road spline. Instead a suggest running invisible road
(kuid:36646:37002 for example) across it which should allow better adjustment of road
height so vehicles are neither buried in or floading above the pavement.