"A lot of the issues are speed and the fact they are going quite slowly, holding up traffic," he said.
Reports of slow driving tended to be in the 70 to 80km/h range, with overseas drivers "quite oblivious" to traffic behind them which in turn made some other motorists "quite anti".
On Friday, while returning from Canterbury via Arthur's Pass, Mr Watson picked up four separate incidents of poor driving.
He urged motorists to report poor driving either by calling *555 from a cellphone, or by taking vehicle details and calling it in to police once they are able to.
According to Tourism New Zealand, arrival growth related to the Chinese New Year celebration is expected to be moderate compared to the big visitor increases in recent years.
Up to 33,000 Chinese New Year-related holidaymakers are expected to arrive in the country over the next fortnight, on top of the normal visitor peak.
Tourism NZ general manager Asia, David Craig, said the moderation in the growth of recent years was not a surprise.
"New Zealand experienced rapid growth in recent years of up to 40 per cent so a slowdown in growth can be expected. It comes at a time that New Zealand has become more expensive and other markets, especially the US and Europe, compete hard for Chinese visitors.
China's economic slowdown means their consumers are becoming more price conscious.
"At the same time Chinese travel behaviour is changing. There are fewer tour groups coming but the number of free independent travellers (FIT) is increasing.
"This has benefits for New Zealand as a tourism destination. Our primary focus is on FITs because they spend more over a longer time period and in more regions."
- Greymouth Star