To increase traffic through Google+ there are few things you need to remember that always add unique and quality content. Always add and share the informational post about your products and services in your wall, increase your visitors or followers to your page share your post on other social media sites like Facebook,Twitter etc....
To increase the traffic through google plus will be depend on your postings or good quality contents will improve your visibility on the search results. Most of the people use g+ for getting the information this will help you to get the traffic for your website.