Annex 3A: Guidelines for Local Gravel Road Rehabilitation 431 Reference Standards for Rehabilitation of Local Gravel Roads Geometric The geometric design standards for local gravel roads are shown in Table 1. For road rehabilitation, it may not be possible to meet all of these standards on all rehabilitation projects. On sub-standard roads safety devices like guard rails, mandatory signs and warning signs may be used to mitigate the road safety risks due to the sub-standard road geometry. Three levels of traffic volumes observed in typical local road networks are cross-matched with three design classes 1 to 3. The Guidelines emphasize the reference to traffic volume as a differentiating attribute, although it is possible that LGUs may exhibit a wide range of traffic characteristics. Corresponding design controls may be chosen by the designer from the recommended control values.