If we liberalise cannabis laws is it likely there will be more people driving while impaired? And how and when should we address this when the number of drugged drivers involved in fatal road crashes last year was more than drunk drivers? Northland road safety official John Williamson explains.

One of the more interesting items on the recent Northland Land Transport Committee agenda was "The Request to Endorse and Promote the Petition of Karen Dow" – sent to the committee by MP Dr Nick Smith.

The petition called for the House of Representatives to urgently introduce random roadside drug testing