The EE Lightning - which could do Mach 2 at altitude even without afterburners - would only barely manage over Mach 1 (761mph) on the deck and even then, only particular variants. The more usual sea level airspeed limit was seen as 650knots/748 mph.
Riggald
riggald
There’s a separate land-speed record for wheel-driven cars. It’s a lot slower than this record.
There’s a separate land-speed record for wheel-driven cars. It’s a lot slower than this record.
Or you can leave helmets as personal choice.
The biggest cyclist safety impact that an be made is to increase cycling participation levels - this has been shown over and over.
Helmets decrease participation, and thereby increase risk. And also increase risk by making motor vehicle-on-bike collisions likelier.
And…
Then feel free to campaign for cyclists to wear helmets designed for protection against motor vehicle collisions. Arai have an excellent range of full-face helmets designed for this.
Bicycle elmets are designed to protect from a fall from head hight at the speed of a brisk power-walk.
I look forward to you campaigning…
The report in the Guardian is of a metastudy of hospital admissions.
Peer-reviewed anecdata?
The whole-population studies show decreased per-journey and per-mile safety where helmets are mandated.
The study on vehicle clearance shows a credible mechanism for this.
Bicycle helmets are designed to protect against a fall from head height at forward speeds up to 7mph. The more expensive the…
Yes, they protect against falls from head height at up to 7mph forward speed.
They do not protect in event of motor vehicle collision.
They do make motor vehicle collisions more likely.
And the whole-population studies show lowered cyclist safety per journey and per mile. Helmets mitigate somewhat against the increased…
Feel free to amend the tenses to your taste, to account for the fact it is a future conditional situation, if Level 5 autonomy means that cars are used on a per-journey basis.
Except where it provides worse than no protection.
http://www.bath.ac.uk/news/articles/archive/overtaking110906.html
Of course, it does provide protection in a fall from head height at the speed of a power-walk. (And I look forward to you beginning to campaign for helmets for power-walkers).
That might compensate for the…
And do you find motorbike elmets to be more, or less, protective than bike helmets?
I’ve seen reports on a cyclist killed when a bin lorry (garbage truck) drove over her.
“If only she had been wearing a bike helmet” said the policeman quoted in the news article.
“Wearing a helmet while cycling makes cycling safer: fact.”
This isn’t actually a fact, for several reasons.
Magical polystyrene protector beanies are nowhere comparable to motorbike helmets.
Bike helmets are designed to protect the head in a fall to the ground from head height, at forward speeds up to 7mph. And the more expensive the helmet, the less protective it tends to be.
Motorbike helmets are designed for motorvehicle…
Actual study shows that motor vehicle drivers give less road clearance to helmet users.
The studies also show that the more cooling a helmet has, the less protection it provides.
And the study onto the matter shows that drivers give less clearance room to cyclists wearing helmets.