Hi MT,
Sorry to hear you got caught on the Western ring carpark and missed the start.
For future reference, a better alternative route is to go up either Nicholson or Lygon street to Coburg, past the old gaol, and get onto the Hume Freeway via Bell Street. This way worked a treat for us yesterday, and despite getting in a bit of a peak hour jam through Coburg, we got to the oval ten minutes before the first bounce.