I was talking to our work insurance broker at a lunch this week, and he was telling an anecdote about driving his daughter to a uni open day when the trains went belly up, and how his little work Toyota aygo coped with 85mph. I expect that would invalidate his insurance in the event of a collision...
(The same guy was astonished when I told him about NT's high average mpg figures...)
I drive very little nowadays, and mostly in a vehicle that can barely exceed 10mph, let alone the limit*. But I do try to keep within limits when I do drive. Like NT, if I go over, it's for a very short period, and not intentional.
Although having said 'not intentional', I take issue with the idea that it's hard to stick to the limit. I really mean my attention has drifted for a moment. Most vehicles, as far as I'm aware, have a brake to retard progress, and an accelerator which can be eased off. Careful use of gears also helps to keep speed regulated. When I have to drive a van at work, I'm rarely out of third gear, pottering about at up to 30.
*It's very relaxing. Foot down, up to max speed, potter along. Loads of reaction time, no stress.
I'd sincerely tell that guy, for the sake of his daughters safety that thinking 'a car that can cope with 85' is a VERY dangerous way of thinking. Some cars can, usually expensive ones...some cars cannot, usually cheap ones.
I was driving a company Ford Escort some years ago, pretty basic model, quite capable of driving at 85 mph. Then someone walked straight into a dual carriageway in front of me....
you try emergency stopping at 85 mph,only then do you know how good a car is at that speed. I fishtailed all over both lanes AND a feeder lane trying to control a car with an average chassis, average brakes, average suspension (and a driver that had overestimated his ability in that car
) I got away with it, but by Christ, it taught me a lesson that day.
Back to OPs question...i have to admit to both extremes of driving ...i rarely travel over 70, mostly travel single lane A roads at 55, but rarely keep to the lower speed limits, i'm always 5 to 10 mph over DEPENDING on conditions, time, traffic and volume of people.
Any 30 mph road in a housing estate...30 mph or less particually if there's kids around.
Any 30 mph road in the city...30 mph or less particually if there's kids around.
Any 30 mph urban road where there are fewer houses and people..generally a bit more than the speed limit.
Any 30 or 40 quiet village road for instance at 6am when there's no one around, i always add 5 to 10 mph.