Abstract: A Zero-turn lawn-mower that selectively restricts movement of front wheels to achieve controlled movement while on slope is disclosed herein. Lawn-mower includes a mower frame, at least one front wheel disposed underneath mower frame, at least one cam, an actuating rod and a dawg. The cam is fixedly connected to mower frame and in the vicinity of front wheel and is further defined with a notch. Actuating rod of said lawn mower is swivelably connected to mower frame and operable by a driver, typically by a rod pedal. Dawg extends from actuating rod to selectively engage with notch to restrict angular movement of front wheel and selectively disengage from notch to enable angular movement of front wheel. This provides the user to control drift of the mower on an angled or inclined surface. Furthermore, A spring is provided at other end of pedal to reduce tension and provide smooth rotation of actuation rod.