The Maryland "Vehicle Emissions Inspection Program" VEIP requires that our vehicles be checked every two years. A notice is mailed about a month in advance so there is plenty of time to have your vehicle checked. If you wait past your notice time then the cost doubles from $14 to $29. (Plus, a new $15 penalty fee is assessed every four weeks.) The emissions test takes only take a few minutes. You are likely to spend more time waiting for the test. Try going mid-month and in the middle of the morning or afternoon to cut down your wait time. Another option is to check out the lines before you go. The Maryland VEIP website has a page that feeds in a picture of the lines, so that you can avoid going if there is a long wait. The photo below is from the Columbia, MD vehicle inspection station.