Obama's limo: "Rolling tank with windows"

Wired looks at President-elect Obama's custom-built limousine, which features 5-inch-thick windows, 19.5-inch truck tires and "possibly even a lock safety mechanism that seals off the car like a bank vault in case of an emergency," all built on a Cadillac truck chassis. The Secret Service, naturally, won't reveal details, but:

In an interview with CNN, security expert Ken Lucci says rubber gaskets likely protect the car against chemical weapons and that the body will be made out of a tougher material than before. The most recent limo used by President Bush used some combination of a dual hardness steel, aluminum, titanium and even ceramics to break up possible projectiles. And there are usually steel overlaps that cover any gaps a door might leave.