Big cars are a costly choice we need to rethink

Bigger is not always better. But when it comes to physics, there’s been no change for some centuries on the law that force equals mass times acceleration. All other things equal, a bigger car will cause more damage and hold up better against a smaller car. As more people hit the road with their heavyweight SUVs and utes, there’s more chance of coming out worse-off in a crash if you’re not driving one yourself.

As more heavyweight SUVs and utes hit the road, there’s a greater chance of coming out worse-off in a crash if you’re not driving one yourself.Credit: Australasian New Car Assessment Program

Small cars can be as safe as a bigger one – but generally, only if we’re comparing a brand-new small car with a larger car which is one or two generations old. A large SUV is among the safest bets in most crash types.

Safety features, modern engineering and innovative technologies can put a smaller car on par with bigger cars, but can be an additional cost for carmakers, which might explain some of the higher proportionate price rises for smaller cars.

While cars have generally been increasing in size across the world, the boom in popularity of big models such as utes in Australia can also be pinned to tax policies including those introduced and ramped up during periods of economic downturn.

The concession allowing small businesses to write off vehicles for tax purposes was born under the Rudd government in the wake of the global financial crisis. Then the maximum write-off amount was increased to $150,000 by the Morrison government during the pandemic. That’s been pared back to assets priced up to $20,000 by the Albanese government, but only since September last year, meaning there would have been an incentive for upgrading to a larger (pricier) car before then.


Certain cars, including utes and four-wheel drives with capacity to carry more than one tonne, are also exempt from fringe benefits tax as long as there is “limited personal use”.

Behind the growth of big cars, there is, of course, changing preferences. There’s probably an element of keeping up with the Joneses as increasing numbers of SUVs and utes dominate the road. But these rugged cars also come with the functionality (and the image) of adventure and the simple, enticing proposition of more space: for kids, pets, legs and more.

Despite concern over the death of the great Australian road trip, Aussies have continued to traverse the country’s vast landscapes. And increasing numbers of people are making those trips using personal and rented vehicles. From 2022 to 2023, the number of people relying on self-driven vehicles increased from roughly 5.7 million to 6.3 million for interstate trips and from 21 million to 22.6 million for intrastate trips.

But there are numerous costs, both personal and societal, attached to bigger cars. While some of the top 10 sold cars such as the RAV4 come in hybrid versions, and the Tesla Model Y also made the list, only about 15 per cent of cars sold in 2023 were hybrid or electric.


Not only does it cost Australians more to feed fuel-thirsty cars such as SUVs and utes, but it comes at a notable cost to the environment, drivers of smaller cars and pedestrians. Both pedestrians and those driving smaller cars are more likely to suffer serious and fatal injuries when they’re involved in a collision with a heavier vehicle.

And the race to get our emissions down is suffering as more Australians choose giant cars. In 2022, passenger cars and light commercial vehicles constituted about 12 per cent of the country’s emissions.

While it’s tempting to stray off-road, we need to make sure costs of fuel-guzzling SUVs and utes, and the benefits of electric vehicles, are reflected in the actual prices paid by consumers.

The tax concession on vehicles purchased for business purposes should be higher for electric or hybrid vehicles, and the Australian Tax Office should more rigorously police personal usage of heavier cars. The Australian government also needs to crack the whip on introducing its overdue fuel efficiency standard, which would place an annual cap on the emissions output for new cars sold in the country and look at making public transport more affordable and accessible.

Preferences take time to change – time we don’t have if we are to meet our emissions targets. From backyards to beer consumption, Australians love going big, but it’s time to take our feet off the accelerator when it comes to big cars and foot the bill.

Ross Gittins is on leave.

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