Free from any standards or protocols, car makers are shifting more of the control of the car’s ancillary devices to the dash-mounted screen.
Led by the example of Tesla, which set the screen standard with the massive 17.0in display on the Model S, car makers are tripping over themselves to increase screen size and, in doing so, burnish their tech credentials. The Honda E comes with two 12.0in screens that run across the width of the dashboard. Ford’s Mach E electric SUV has a 15.5in screen and next year’s Cadillac Escalade SUV will have a whopping 38in curved screen.
Touchscreens are becoming the norm. In the US, 82% of cars sold in 2019 had one, compared with 53% five years previously, according to data from IHS Markit.
The design of the interface obviously has a bearing on the distraction. TRL used Apple CarPlay and Android Auto phone-mirroring screens for its study because the look and action is common to all screens that offer them, but car makers approach their own design interface in many different ways. A test this year by Autocar sibling brand What Car? ranked 20 screens, with the MG ZS EV’s 8.0in touchscreen marked the worst for distraction and the BMW 3 Series with Live Cockpit Professional the best.
The test concluded that all screens were worse than physical buttons for time taken to enact a task. For example, adjusting the heater fan on a touchscreen rather than a dial or physical switch can take more than twice as long, while zooming out on sat-nav or finding a radio station can take up to eight times as long.
A mix of (more) technology and legislation could be the answer. The increased prevalence of automatic emergency braking has spared the blushes (if not the lives) of an increasing number of distracted drivers and lane assist can prevent them drifting into the oncoming lane.
Eye-trackers are also being considered by the European Union to warn drivers if their gaze has shifted away from the road ahead for too long. This is likely to be more important as elements of autonomous driving are allowed, but there’s a use for it to alert drivers to just how long they’ve been looking at the screen. The TRL study found that drivers greatly underestimated how long their eyes were off the road while operating screen functions.
Kinnear worries that post-Covid budget constraints will kick any government action into the long grass, but it’s clear that action needs to be taken as the digital arms race continues unabated.
“They aren’t many standards car makers have to meet [in screen design] so they design features they want the drivers to engage with or sell. That means the inclusion of features such as being able to read text messages just became a standard part,” said Kinnear. “But we really have to question whether that’s a benefit or actually a detriment to attention.”