Many city streets across Europe might be more crowded than ever, but that hasn't stopped Audi from building its biggest-ever car, the Audi Q9, seating up to seven people and competing with the Mercedes GLS and BMW X7. TSP/Audi AG/dpaAudi has launched its largest-ever SUV – the Q9.Acting as the first time that the brand has used the number 9 in its model range, the Q9 measures in at 5.31m long and 2.21m wide, making it one of the largest cars arriving out of Europe later this year.As standard, the Q9 will offer seating for seven people, though an optional six-seater version will be available for those who want even more space for each passenger.AdvertisementAdvertisementThe Q9 also benefits from Audi's largest-ever panoramic sunroof, which incorporates an area of more than 1.5 square metres. It can be opened and tilted, too, rather than remaining fixed and will even be available with illumination which can be adjusted to match the ambient lighting of the interior. It'll automatically turn opaque when the car is parked to help block light from warming up the cabin.All seats are electrically adjustable – in both six- and seven-seater layouts – while the very front chairs get heating, ventilation and massage functions as standard. The door armrest and central armrests are heated, too, and activate when the seat heating is switched on.Dual wireless smartphone charging pads come equipped as standard, while several storage areas located throughout the cabin should help to keep things organised. There's a 14.5-inch infotainment display, too, alongside an 11.9-inch virtual cockpit and a 12.3-inch passenger display, all of which come as standard. The integration of ChatGPT into the car's system also allows occupants to easily look up information via voice command.Powered by a 3.0-litre turbocharged V6 diesel engine, the Q9 also gets mild-hybrid technology with a special generator developing an extra 24bhp and an additional 370Nm for improved performance. It's driven to all four wheels via Audi's quattro system and an eight-speed automatic gearbox.The new Audi Q9 is expected to go on sale next month ahead of first deliveries towards the end of the year.