Traffic on the Waianae-bound lanes of the H-1 freeway was backing up tonight after a series of accidents starting about 7:23 p.m.

A three-car collision near Middle Street forced police to divert traffic to the Airport Viaduct until the vehicles could be towed away.

About two minutes later, a motorcyclist crashed near the Likelike offramp, forcing police to temporarily close all lanes and divert traffic off the freeway at Houghtailing Street.

The motorcyclist went to the hospital and police requested the motorcycle be towed away so the lanes could be reopened.

Two cars crashed about 7:34 p.m. near the Palama Street off-ramp, slowing traffic but the vehicles were already on the shoulder, police said.