Es per ance ▁Highway ▁as ▁National ▁Route ▁ 1 , ▁while ▁the ▁National ▁Highway ▁follows ▁C ool g ard ie - Es per ance ▁Highway ▁north , ▁as ▁National ▁Highway ▁ 9 4 . ▁After ▁reaching ▁Es per ance , ▁Highway ▁ 1 ▁follows ▁South ▁Coast ▁Highway ▁to ▁R aven st hor pe ▁and ▁Alb any , ▁and ▁then ▁follows ▁the ▁coast ▁to ▁Wal pole . ▁The ▁highway ▁dep arts ▁Wal pole ▁as ▁South ▁Western ▁Highway , ▁trav elling ▁north - west ▁to ▁Bun bury ▁via ▁Man j im up , ▁Br idget own , ▁and ▁Don ny bro ok . ▁The ▁highway ▁follows ▁Robert son ▁Drive , ▁Bun bury ' s ▁ring ▁road , ▁and ▁then ▁heads ▁north ▁via ▁For rest ▁Highway . ▁At ▁Lake ▁Cl if ton , ▁Old ▁Coast ▁Road ▁takes ▁Highway   1 ▁north ▁along ▁the ▁coast line ▁to ▁H alls ▁Head , ▁south ▁of ▁Mand ur ah . ▁From ▁H alls ▁Head , ▁the ▁highway ▁by pass es ▁Mand ur ah ▁via ▁Mand ur ah ▁Road , ▁and ▁continues ▁north ▁along ▁that ▁road ▁to ▁K arn up , ▁at ▁the ▁edge ▁of ▁the ▁Per th ▁Metropolitan ▁Region . ▁ ▁Per th ▁Highway ▁ 1 ▁continues ▁north ▁from ▁K arn up ▁as ▁En nis ▁Avenue ▁to ▁Rock ingham , ▁and ▁then ▁to ▁Pal my ra , ▁east ▁of ▁F rem ant le , ▁as ▁P atter son ▁Road , ▁Rock ingham ▁Road , ▁and ▁Stock ▁Road . ▁The ▁highway ▁travel s ▁east ▁along ▁Le ach ▁Highway , ▁concurrent ▁with