A20 vs A2 vs A13 outer London - which quickest

[chris7676]

I'm planning to get to Brands on one Saturday through one of these roads and simply would like to ask which is likely to be the quickest (traffic, speed limits, etc) as don't know these roads. Thanks in advance

[chris7676]

Just north of Finsbury Park this time... Seems like getting to Blackwall Tunnel is not a bad option?