I certainly have heard a number of anecdotal comments like that, and I hope they're in the minority because it's unlikely to improve your driving. That said, there are some people who have anxiety and so forth, and maybe at a low dose there may be some benefit, but I certainly would not argue that it is something that would improve your driving.
I think most studies have shown that, when people are high on cannabis, they tend to be much more aware. Unlike with alcohol where you tend to take more risks, etc., you would drive more slowly, etc., but that's not universal. Certainly the report from the DRE has shown data that they've.... In fact, in the study I showed you, a lot of those people were arrested for speeding and so forth. It's not a universal thing. Most studies show that, on average, people are much more aware of their cognitive status than when using alcohol.