When you receive a Page Rank from Google, it means Google has accepted your Website as being legit and will do its best to route real people to your website ( that is Targeted Traffic ) to your website. If the goal of your website is to attract more relavant traffic to it, a wise avenue to persue is Search Engine Optimization ( SEO ) of your website. By employing SEO to your website, it has a much better chance of attracting more relavent people to your website. But in a nutshell, Yes if your website has achieved a page rank from Google, it will have a better opportunity to recieve more traffic.