Route ignoring major highway when travelling Lithgow to Kurrajong

B59 not selected when travelling Lithgow to Kurrajong. Do not know why?

From Lithgow to Sydney there are two major routes. For some reason, ABRP always selects the Great Western highway (A32). We ususally travel the B59 (Chifley Road/ Bells Line of Road) to destinations in Northern Sydney. Even when selecting twons on the B59, the routeplanner will select the A32 and bring you back up the B59 to the village.

https://abetterrouteplanner.com/?plan_uuid=fd28ac44-43cd-4fb0-b998-93da43d6993b