 The route ascends Ten Mile Run Mountain and passes through more forests to the north of a quarry, climbing a steep hill, and curves to the northeast, flattening out into a mix of farms, woods, and homes.CR 518 reaches its eastern terminus at an intersection with Route 27 (though which the border between Franklin Township, Somerset County and South Brunswick, Middlesex County runs).The entirety of this road was created as part of the Georgetown and Franklin Turnpike, incorporated in 1816 to run from New Brunswick to the Delaware River at Lambertville.