This vehicle comprises a guard rail (15) intended to occupy a lowered position delimiting a closed space that prevents a passenger from falling and a raised position in which the guard rail (15) opens up the space at the front of the vehicle to allow one or more passengers to board and disembark, and means for locking the guard rail (15) in the lowered position, characterized in that the locking means comprise a locking lever (20) comprising a first end (22) provided with a bearing surface (24) and with a blocking surface (25), the bearing surface (24) and the blocking surface (25) delimiting a first housing (30) intended to accommodate part of the guard rail, and a second end (23) in which a locking member designed to immobilize the second end (23) of the locking lever (20) is intended to engage when the guard rail (15) is in the lowered position. Figure 3.
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