ISAs have been around for nearly a decade but have evolved over time, so fixing on a definition of exactly what an ISA is can be a challenge. In essence, an ISA system is a combination of a forward-facing camera that can recognise speed limit signs and is integrated with mapping data so the car should know what speed limit applies for its actual location (in case the camera misses a sign, or the sign is blocked by a hedge). The system can provide speed limit information to the driver, and it can also ease up on the accelerator to gently bring the car down to the speed limit. Car manufacturers have been offering ISA as an option on new cars since about 2015, finessing the technology on each new model, and ISA has been mandatory on all new cars sold in Europe since 2022. Note that although fitment of ISA is mandatory in Europe, the driver can choose to switch ISA off if they want to.
Because my professional life is devoted to improving road safety, I naturally start with that as ISAs greatest benefit. ISA is part of the bundle of vehicle technologies included in the 2015 update to the European General Safety Regulations1. When the UK Government consulted in 2022 on adoption of these vehicle technologies2, many respondents recognised that the maximum benefit of the regulations could only be achieved if all the technologies were included. Professor Oliver Carston at Leeds University calculated that GB could see up to 12% reduction in injury accidents due to ISA, depending on exact system in use and the road type3. That equates to thousands of people walking away from road collisions unharmed or with lesser injuries, and many more avoiding collisions altogether.
I personally choose to keep my ISA turned on in my car all the time. It stops me getting speeding fines. It saves me money on my fuel bill, which is always very welcome. But, best of all, it provides an extra set of eyes, which I find particularly helpful when I’m navigating new places, or the roads are busy. ISA gives me the head space to concentrate on things other than my speed, and that makes me a better driver. On a motorway, if ISA is working in conjunction with cruise control, I can relax and enjoy the journey. I have been pleasantly surprised by how much less tired I am after a long journey when using this system.
Critics also complain that the technology is imperfect. Well, so is every human driver! In the rare event an ISA system malfunctions, you will get a warning. How inconvenient is it, in reality, to simply override it or turn it off? In my car, it’s a tap of the accelerator or a touch of a button. I can’t fault the ease of use.
That’s all in the future, however. For now, ISA needs cameras to “read the road” ahead and “see” actual speed repeater signs. I believe that ISA would be more popular if it could be helped along a bit... for example by local authorities cutting hedges and making sure speed signs are clearly visible, or by having variable message signs (VMS) broadcast simple alerts to oncoming vehicles of a temporary speed restriction. Yes these things cost money, but all cost-benefit calculations come out in favour of the investment.
Europe has been enjoying the increasing benefits of ISA since 2022. Here in the UK, we are still waiting for a decision from Government on adopting the full set of measures within the General Safety Regulations. It’s complex, requiring new Type Approval Regulations and a new legal framework. On the bright side, whilst OEMs are not obliged to sell cars with ISA in GB, it is in their commercial interests to do so. They get a higher score in Euro NCAP ratings, which boosts sales. So, we are seeing increasing choice of new vehicles with ISA included. Fleet managers, always at the cutting edge when it comes to introducing new things to make life better for drivers, are doing a great job of prioritising the purchase of vehicles with ISA, and helping to educate drivers to effectively use ISA.
Turn your ISA on and try it – you might enjoy it as much as I do.
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- The General Safety Regulation (GSR - Regulation (EC) No 661/2009) and the Pedestrian Safety Regulation (PSR - Regulation (EC) No 78/2009). The GSR specifies the type-approval requirements for the general safety of motor vehicles, their trailers, and systems, components and separate technical units; the PSR sets out the type-approval requirements for motor vehicles with regard to the protection of pedestrians and other vulnerable road users. All vehicles sold in the European Union must comply with the regulations.
- GSR consultation report – recognising that the majority of respondents agree that maximum benefit can only be achieved if GSR adopted in full Future of transport regulatory review: modernising vehicle standards - GOV.UK (www.gov.uk)
- Carsten O, Lai F, Chorlton K, Goodman P, Carslaw D and Hess S (2008). Speed limit adherence and its effect on road safety and climate change: Final report. University of Leeds. isa-report.pdf (nationalarchives.gov.uk)
- Automated Vehicles (AV) Draft Bill, Pat 6, Clause 93 “Provision of information about traffic regulation measures” will require local authorities to send the legal traffic regulation orders they make (e.g., to set speed limits, close roads and designate parking bays) to a central digital publication platform.