Whanganui police focusing on impairment and driving during March 10 Mar, 2021 04:00 PM 3 minutes to read There were 320 deaths on New Zealand roads in 2020 and impairment is suspected as a factor for a quarter of them. Photo / Bevan Conley There were 320 deaths on New Zealand roads in 2020 and impairment is suspected as a factor for a quarter of them. Photo / Bevan Conley Whanganui Chronicle Whanganui police have joined the national focus on impairment and driving this month in an effort to crack down on fatal crashes. The 2020 New Zealand road toll was 320. Sergeant Colin Wright, who heads the Whanganui Road Policing Group, said several factors caused crashes, and impairment was thought to be a factor in about a quarter of fatal crashes.