From Halopedia, the Halo wiki
A Roamer can seat a driver and a passenger in its front compartment and then at most three people in its backseat. Doors open on either side of both back and front portions and there is a back window. Passengers can strap themselves into their seats. On December 14, 2553, a Roamer carrying President Arlo Casille and Minister Duena Sandos was ambushed by two United Nations Space Command teams working in concert.
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