Police staff stopped vehicles between 2am and 5am, handing out fliers and asking motorists whether they saw anything early on May 13 or had any other relevant information.
Tom Fry (18) was riding his motorcycle to work on a Morven dairy farm when the crash occurred at the intersection of SH1 and York St about 3.50am.
Operation Rich inquiry head Detective Senior Sergeant Colin Blackie said 78 vehicles were stopped on SH1, netting 12 positive lines of inquiry; and 38 vehicles were stopped on Horse Gully Rd, with eight positive lines.
Cam Paul Kennedy, the 25-year-old male driver of a Nissan Skyline car, which was at the scene of the crash, will appear again in the Invercargill District Court today charged with perverting the course of justice, failing to render assistance after a crash and failing to report a crash.
There were two Oamaru police officers and two officers from the Otago rural drink-drive unit from Alexandra, experienced in setting out checkpoints, at the SH1 checkpoint. They were later joined by Det Snr Sgt Blackie and Oamaru Detective Sergeant Mike Ryder.
A highway patrol officer manned the checkpoint on Horse Gully Rd.
Apart from being questioned about what they may have seen, motorists were given a flier asking "Have You Seen This Vehicle" with a photograph of a silver Nissan GTS. It said a Skyline, similar to the one in the photograph, was linked to the crash in which Tom died, and asked for any information people might have about the crash.
The flier also had a photograph of Tom, along with the appeal: "Please help us find out what happened to Tom."
Most of those stopped at the SH1 checkpoint were long-distance truck drivers from outside the area, some of whom did not know police were seeking information about the fatal crash. Some were able to assist the inquiry through what they saw when they passed through the area on the morning of the crash.
Almost all the motorists, despite the early hour, were happy to assist, answering questions and providing contacts for follow-up inquiries if they were needed.
The only disruption to the checkpoint was about 4.30am when a house being transported south meant cones and vehicles had to be moved to make way for the wide load.
Police are still seeking information, and people can contact Oamaru police (03 433-1400) or anonymously Crimestoppers (0800 555-111).
