* narrow looking roadway * speed limit signs * your car has self driving * what everybody else is doing * speed limiter on your car * curvy road * bad weather * male or female * risk appetite * driving experience * experience of that route * perceived risk of getting caught

If you fix "speed choice" the problem of speeding diminishes.

The 1996 movie Transpotting still gives me shivers up my spine by putting someone in a car and drop at ER rather than calling for help. Too many people die needlessly, even today, when well meaning people load shooting victims, stroke victims and heart attacks etc into their car and drive to ER without asking their local emergency services for advice.

PS. You can't 100% of the time get to ER faster than the ambulance. There are more ambulances than emergency rooms by number. If an ambulance is at the county hospital they'll be faster than you.

Basic issues like overhead powerlines make life difficult for helicopters. They are used in rural Australia as an alternative to road, but only due to time saving. In a city, well you get a road ambulance/paramedic/medical team.

The (Melbourne) Victorian Ambulance Cardiac Arrest Registry claims third best in the world in out of hospital cardiac arrest.

Since 1998, in Melbourne for anything that might need a defibrillator a fire engine is sent at the same time as the ambulance (EMR Emergency Medical Response Program). https://www.mja.com.au/journal/2002/177/6/cardiac-arrests-tr... Medical Journal of Australia article. There is also GoodSAM https://www.ambulance.vic.gov.au/goodsam/ for individual helpers

Less of it about now but used for multilingual websites for the secondary language, particularly if non-latin alphabet. Will no-one think of Unicode!

In my Australian State, South Australia, this a huge contrast with police who buy new from the manufacturer, get a three or maybe five year service contract from the manufacturer and then sell them when the warranty expires and they've done around 100,000 km (60,000 miles). So no servicing worries and they get some tax benefits so it works for them.

Ambulances have less mileage and my guess is retire after 10 years. Ambulances are very standardised so can swap metro and country vehicles to get value from the asset. There was a "twin life" ambulance (http://www.old-ambulance.com/Twin-Life.htm) that had a long life rear bit on a light truck chassis so swap out the motor bit two or three times every 200,000kms, but these days vans are used. There was much sadness in the ambulance fleet buying community when Ford discontinued the F150 type chassis in Australia.

But your average (fire/rescue) appliance in the city or country has low mileage. In the city plenty of use but never have to drive far. In the country not much use but do drive further but end up the same a very old vehicle without much mileage on the clock. Trailers can be even older 50 or 60 years before retirement. Another issue with a fire appliance is they carry water which is heavy, three tonnes is a pretty common load. And have other readers have mentioned a monopoly on manufacture wouldn't help.

Note that extending the lifetime is key to taking advantage of their lower base material cost. Lot of work needed there.