A Libyan government tank destroyed by Western air strikes sits beside the coastal highway near Ajdabiyah in eastern Libya, March 31 2011.

The exact position of the front line is difficult to know in a war of rapid movements in both directions across open desert, but one constant is the presence of the road, along which Libya's revolution has travelled, back and forth as each side advances and retreats across vast distances, leaving behind a wake of destruction and death. Caption: Tire tracks mark the coastal highway outside Brega in eastern Libya, March 31 2011.

A burned out vehicle sits on the coastal highway outside Brega in eastern Libya, March 30 2011.

Libyan government tanks destroyed by Western air strikes sit in a field along the coastal highway outside Ajdabiyah in eastern Libya, March 30 2011.

Vehicles destroyed by Western air strikes lie along the coastal highway outside Ajdabiyah in eastern Libya, March 30 2011.

The track from a Libyan government tank destroyed by Western air strikes sits in the rubble along the coastal highway outside Ajdabiyah in eastern Libya, March 31 2011.

A tyre and army boots lie near the scene of a Western air strike in the rebel-held town of Ajdabiyah, March 30 2011.

The remains of a Muammar Gaddafi loyalist soldier lies under blanket after French airstrikes on the outskirts of Benghazi in northeastern Libya, March 20 2011.

The charred remains of a Muammar Gaddafi loyalist soldier lies trapped under a burned out vehicle destroyed during French airstrikes on the outskirts of Benghazi in northeastern Libya, March 20 2011.

Pipelines run through the oil refinery at Zuietina near the northeastern Libyan town of Ajdabiyah, March 22 2011.

A fuel pump is defaced with a graffiti caricature of Muammar Gaddafi in the rebel-held town of Ajdabiyah March 31 2011.

The ransacked lobby of a hotel in Ras Lanuf after forces loyal to Muammar Gaddafi fled westward following coalition air strikes in eastern Libya, March 27 2011.

A Libyan army vehicle destroyed by Western air strikes along the coastal highway through Ajdabiyah in eastern Libya, March 30 2011.

A Libyan government tank destroyed by Western air strikes sits at a roundabout along the coastal highway through Ajdabiyah in eastern Libya, March 30 2011.

Sand blows across the coastal highway near Brega in eastern Libya, April 1 2011.