Brass Monkey Rally organisers have joined with police to clamp down on motorcyclists travelling to the rally on the Dunstan Trail, following safety issues on the trail last year.
Rally committee spokesman John Willems said the actions of ''a number of riders'' last year had prompted the move.
Several riders had ridden with excess breath-alcohol and been processed by police and later convicted.
There were three motorcycle crashes on the trail, resulting in three victims being airlifted to Dunedin Hospital.
Mr Willems said this year police would be monitoring the trail and breath-testing all riders.
Rally organisers were also reminding motorcyclists the Dunstan Trail was a public road, and as such all vehicles needed to be registered and warranted.
Previously, some rallygoers were travelling on dirt bikes which might not have been road legal, and rally organisers, with the permission of police, had provided a ''road escort'' for such bikes to travel the last few kilometres from the end of the trail to the rally site, Mr Willems said.
This year, rally organisers would not be providing a road escort, he said.
''This will not be needed as all vehicles must be road legal.''
Mr Willems emphasised the rally, organised by the Otago Motorcycle Club, had a ''good relationship'' with police and it was a joint decision by rally organisers and police to clamp down on travel on the Dunstan Trail.
Last year, about 1300 people attended the rally, Mr Willems said.
