Standard Chartered Hong Kong Marathon on 17 February

Drive eastbound along Gloucester Road towards the Cross Harbour Tunnel. Drive past what is the usual last turn off (Marsh Road) and instead drive on staying in the very left lane until you get to the bus lane (the one that you always see buses use to go from Hung Hing Road to access the tunnel traffic). 

Below is a view of Hung Hing Road showing where you will be coming off from Gloucester Road to Hung Hing Road