Evaluation of diagrammatic guide signs. Paper presented at the 51st Annual Meeting of the Highway Research Board HRB, Washington, D.C., January 1972.

The author reports a laboratory study designed to replicate the findings of the Eberhard-Berger research. (See B 2110 and B 2467). Using similar but not identical laboratory techniques, Gordon's work shows that conventional signs are superior to diagrammatic signs at all interchange types tested, i.e. freeway cloverleaf intersection, a lane drop, a multi-split ramp, a left ramp downstream from a right ramp, two right ramps in quick succession, and a major fork.