The car is one of the most important environments for voice assistant use today with a history stretching back over 20 years. This is our third installment of the In-Car Voice Assistant Consumer Adoption Report. Earlier reports evaluated data from the U.S. only but for 2021 the report has expanded to also include the UK and Germany. The 2021 report incorporates over 30 charts and nearly 50 pages of analysis. In addition to the adoption and use data collected from more than 3,000 consumers, there is also a breakdown of a new model for in-car voice assistants that has emerged since 2019 as well as a review of the most recent trends and news that are shaping the trajectory of the solution space.