View-through conversion tracking provides additional information related to the value of your Ad Exchange ads. This feature provides a measure of the number of online conversions that happened within 30 days after a user saw, but did not click, an Ad Exchange ad. View-through conversions are tracked via a cookie that is placed on a user's computer; conversions are reported only for Ad Exchange ads that run on Ad Exchange sites.
Roadblock Advertising allows advertisers to own 100% of voice for a given period, usually a day. In other words, an advertising campaign would run exclusively across all the advertising units on a page reinforcing the advertising message. Ideal for a brand or product launch when the aim is to gain brand awareness quickly.