A jackknifed big rig (do they ever do anything but jackknife?) carrying tons of diesel fuel on (the) 101 has shutdown the highway in both direction in Menlo Park. The accident happened just after 10 p.m. According to the Gate, "[t]hree northbound lanes and two southbound lanes are closed near the Marsh Road interchange, snarling traffic in both direction." So far four people have been injured. The extent of their injuries is not yet......