twitter hashtags can drive more traffic?

Yes, this is possible.

About the hastags on Twitter, please read https://support.twitter.com/articles...gs-on-twitter#

To increase possibility of visibility, you need a lot of followers on your Twitter account.

Go to Twellow, we Follow or another Twitter directory to find Twitter users in your demographic.
Follow 10 to 100 every week to slowly build up your following. Many people receive alerts from people who follow them, and then follow your account in turn.

instead of writing "Today's deal is $5 off a Mad Men-inspired cardigan," write "Today's #deal is $5 off a Mad Men-inspired cardigan." Include your website and/or a coupon code to drive people to your site. Users will click on "#deal" and your post will come up in their list, or Twitter aggregate sites, like CheapTweet, will pull all of the hashtagged deals from the day from Twitter and list them on their site.
Follow trending topics, which are popular hashtags, on Twitter. When a topic relates to your industry, or you have something to say that correlates with the topic, use the hashtag along with a comment and your URL.

# tags allows you to separate the category in Twitter, Then traffics easily to recognize the their keywords through the tags easily and they would generate to you as traffics