Clashes between police and protesters at the site of the contentious Roe 8 road project in Perth's south look set to escalate, despite a High Court challenge to the multibillion dollar project failing.

WA Environment Minister Albert Jacob says land clearing could be complete by the March state election as opponents vow to keep fighting. Fences starting going up last week for Roe 8, which will be WA’s first toll road despite state government indecision on the rest of the route for the…