Abstract: Cam-lobe radical-piston hydraulic motors can achieve ultrahigh power rotary output (up to megawatts), which are widely used in tunnel boring machines, dredgers, and other high-end equipment.

In just over a week, roadside drug testing of drivers will begin in Wellington, with the aim to roll it out nationwide by mid-2026. So how will it work? And how reliable will this testing be? Hayden ...