The final three contestants will be pitted against the traditional challenges, including the Mega-Challenge, the challenge incorporating elements of previous challenges, as well as the road test through the streets of downtown Toronto. At the end of it all, one will be named Canada's Worst Driver.
Straight Line with a Twist — The season finale kicks off with Canada's Worst Driver 3 's Straight Line challenge, but with a (literal) twist in the middle. Contestants must accelerate to 40 km/h between two concrete barriers with only 8 cm clearance on either side. Ashley manages to calm down enough to finish after 20 minutes, while it only takes Amy (going last and thinking strategically) 10 minutes (all of her previous runs were underspeed). Emily fails in her hour.
The Mega-Challenge — The annual Mega-Challenge consists of three legs: a combined slalom and Eye of the Needle portion, a leg with a skid and a Snake, and a final obstacle course in reverse and the Teeter-Totter. All three manage to get trouble in the first leg, though Amy manages to recover somewhat in later legs. Ashley and Emily, however, had to have the course altered after their frustrations boiled over — Ashley (performing the challenge on her son's birthday) admitting that she may be Canada's Worst Driver.
The Road Test — This year's road test takes place in downtown Toronto during Friday rush hour traffic. For the second straight season, Andrew's truck was used for the challenge. Emily's run is overly cautious, causing nine citations for blocking traffic. Amy, who wants to address driving with Bob as a passenger, has Bob in the passenger seat. Amy only makes six moving violations, all while Bob plays the role of tourist. Ashley's run is far worse: when told to stay on Lake Shore Boulevard, she manages to find her way onto the Gardiner Expressway, and her run slowly goes downhill — to the point where the alternator dies in the final moments. Andrew asks her to safely park the truck up, but in doing so Ashley commits one last ticketable offence, by parking in a marked disabled spot. Meanwhile, on Ashley's run, Andrew meets two tourists from Belgium who are fans of the show's Belgian counterpart, Y'a pas pire conducteur.
At the end, the judges agree that Amy is not Canada's Worst Driver, and is the last graduate of the year. Between Ashley and Emily, though, the judges were divided: Philippe and Dan consider Emily to be the worst, feeling that her driving skills never showed any real improvement and that (aside from Donna) she was the worst challenge performer in every single episode this season. On the other hand, Cam and Dr. Gembora feel that Ashley is the worst, noting that whereas Emily had at least agreed to address her bad eyesight by wearing glasses, Ashley had made no attempt to improve her bad temper or her relationship with Bryan, and that her superior technical skills would be of no help if she got into an accident through distraction or road rage.
Andrew is left with the deciding vote and names Ashley as Canada's Worst Driver; a decision she is not too happy with, not least because she leaves the Driver Rehabilitation Centre with her car on the back of a tow truck. Ashley is clearly furious at the decision, to the point of refusing the trophy and wanting to move to another continent. However, Andrew does remind the audience that, in a year's time, there will be more drivers, and the Driver Rehabilitation Centre will be open once more, when someone else will be given the title of Canada's Worst Driver.