▁mostly ▁separated ▁by ▁distances ▁of ▁, ▁except ▁for ▁Sal mon ▁G ums – Gr ass ▁P atch ▁and ▁Gib son – Es per ance ▁which ▁are ▁only ▁ ▁and ▁ ▁apart ▁respectively . ▁ ▁Main ▁Ro ads ▁Western ▁Australia ▁mon itors ▁traffic ▁volume ▁across ▁the ▁state ' s ▁road ▁network , ▁including ▁various ▁locations ▁along ▁C ool g ard ie – Es per ance ▁Highway . ▁In ▁ 2 0 1 3 / 1 4 , ▁the ▁traffic ▁volume ▁r anged ▁between ▁ 3 5 0 ▁and ▁ 4 0 0 0 ▁vehicles ▁per ▁day , ▁with ▁the ▁highest ▁volume ▁recorded ▁south ▁of ▁South ▁Coast ▁Highway . ▁The ▁highest ▁percentage ▁of ▁heavy ▁traffic ▁was ▁ 5 1 . 6 % ▁north ▁of ▁Gold fields ▁Highway . ▁ ▁The ▁reported ▁safety ▁of ▁C ool g ard ie – Es per ance ▁Highway ▁has ▁varied ▁between ▁assess ments . ▁Re ports ▁commission ed ▁by ▁the ▁Royal ▁Autom obile ▁Club ▁of ▁Western ▁Australia ▁( R AC ) ▁in ▁ 2 0 0 6 ▁and ▁ 2 0 0 8 ▁the ▁entire ▁highway ▁a ▁three - star ▁safety ▁rating ▁out ▁of ▁five . ▁The ▁state ' s ▁overall ▁highway ▁network ▁was ▁generally ▁r ated ▁as ▁three - star ▁or ▁four - star , ▁with ▁around ▁ 1 0 % ▁in ▁ 2 0 0 6 ▁and ▁ 5 % ▁in ▁ 2 0 0 8 ▁receiving ▁a ▁two - star ▁rating . ▁The ▁National ▁Highway ▁section ▁was ▁ass essed ▁by ▁the ▁Australian ▁Autom obile ▁Association ▁in ▁