(E) If 6 or more lanes, use 17 ft. If the truck traffic is less than 250 DDHV use 15 ft.
(F) If 6 or more lanes, use 12 ft. If truck traffic is less than 250 DDHV, 10 ft treated width may be used.
(G) Use 10 ft if truck traffic is less than 250 DDHV. If 10 ft treated width is used, graded width may be reduced by 2 ft.
(H) Guardrail offset is treated width plus 2 ft.
(I) A fully paved shoulder is preferred, but may not be economically feasible. Therefore, a minimum 2 ft of the treated
shoulder should be paved. The remainder of the treated shoulder may be either stabilized aggregate or bituminous surface–treated
material according to the criteria stipulated in Notes (K) and (L).
(J) Use bituminous surface treated if design year ADT includes between 250 and 1000 (B) and (C) truck units.
(K) The median shoulder width criteria for interstates, other freeways and expressways shall apply to the medians of divided
arterials and divided collectors.
(L) Stabilized aggregate may be used on state-maintained roads if the design year ADT includes less than 250 (B) and (C)
truck units. Paved shoulders are recommended if the design year ADT includes over 1000 (B) and (C) truck units.
(M) Use 6 ft if design year ADT includes less than 501 (B) and (C) truck units. If 6 ft treated width is used, graded width
may be reduced to 10 ft and minimum barrier offset will be 8 ft.
(N) Whenever a design exception is approved for graded shoulder width, the guardrail offset may be reduced but shall not
be less than 4 ft.
(O) A 6-ft turf shoulder may be used with a 4:1 or flatter foreslope.
(P) See AASHTO’S Guidelines for Geometric Design for Very Low-Volume Local Roads for values.
(Q) An 8-ft graded shoulder may be used with a 4:1 or flatter foreslope.
Source: Location and Design Manual, Vol. 1, Roadway Design, Ohio Department of Transportation, with permission