CLAUSE 806 (WET MIX MACADAM) 28 APPENDIX D: PROVISIONAL SPECIFICATION FOR ... Road Note 29 as opposed to LR1132. A study on thickness design for unbound gravel road pavements was carried out by J M Golden(3) in 1980. In this paper a thickness design ... from construction records or by digging trial pits. FWD deflection plots can be used as an