A crash between a motorcyclist and bus on the Warringah Freeway just north of the Sydney Harbour Bridge closed two of the freeway's city-bound lanes on Monday morning.
Police and paramedics were called to the freeway, near the intersection with Mount Street at North Sydney, just before 8.20am to reports that a male motorcyclist had slid under a bus.
A NSW Ambulance spokesman said paramedics treated the motorcyclist, thought to be aged in his 30s, at the scene before taking him to Royal North Shore Hospital in a stable condition.
Two of four city-bound lanes of the Warringah Freeway were initially blocked at North Sydney while paramedics treated the man, the Transport Management Centre (TMC) said.
All lanes reopened just before 9am, but a TMC spokeswoman said traffic in the area was still heavy and motorists should expect delays.