A semi-automatic transmission is in which a few of the Procedure is automatic (normally the actuation of the clutch), but the driver's input is necessary to maneuver off from a standstill or to change gears. As a result, gearbox is essential to manage output velocity & torque. As per the https://landenadbaw.livebloggs.com/40553055/5-simple-statements-about-automobile-gearbox-explained