a rider support for carrying a rider,

at least three wheels mounted below said rider support for carrying said rider support and for enabling said vehicle to roll when placed upon a riding surface,

said wheels being spaced to stably support said vehicle in a statically stable mode to normally prevent said vehicle from tipping when placed upon said riding surface,

a motor and a power transmission for rotating at least one of said wheels for propelling said vehicle along said riding surface,

a speed control coupling attaching said rider support to lower components of said vehicle and arranged to enable said rider support to tilt relative to said lower components, such tilting occurring in a generally forward or backward direction,

a speed control for enabling said rider to control the rolling speed of said vehicle in response to said forward or backward tilting of said rider support,

a steering control for enabling said rider to tilt said rider support in a generally side-to-side direction and in response to such tilting, steer said vehicle to the side in which said rider support is tilted when said vehicle rolls upon said riding surface,

said rider support having an upward facing surface of a size and shape predetermined to enable operation of said vehicle by a rider situated upon said rider support in a standing, sitting, or kneeling riding position,

said upward facing surface being generally free of upwardly extending protrusions which would otherwise substantially inhibit said rider from operating said vehicle in any of said riding positions,

whereby said rider may control the rolling speed and steered direction of said vehicle by appropriate tilting of said rider support when said rider is situated upon said rider support in any of said riding positions.