After entering through Blackberry gate (main Lab gate) stay on Chu Road.
At the traffic circle take the first right onto Smoot Road. Smoot Road turns into McMillan Road.
Take the 2nd right onto Lawrence Road
After coming to the 2nd stop, make a sharp left onto Segre Road (in-front of the fire station, building 45)
Stay left then stay Right onto N Road (shown on map below)