Cutting speed limits for cleaner air?

[RDMcG]

Pan Pan Pan said:

Point taken, but similarly but if you believe in factually accurate statements, you could have included, that in the US the blanket 55 mph limit was rescinded in 1995 rather than the vague `this has been true for decades'

Parts of Texas are now 85mph

[Digga]

turbobloke said:

Your typical marxist agitator promoting such guff is very generous, they have nothing and want to share it with you.

He was happy to share the trough with his sons mind you; 25 council houses sold below market value back in 1998: https://www.pressreader.com/uk/sunday-express1070/...

[turbobloke]

Digga said:

turbobloke said:

Your typical marxist agitator promoting such guff is very generous, they have nothing and want to share it with you.

He was happy to share the trough with his sons mind you; 25 council houses sold below market value back in 1998: https://www.pressreader.com/uk/sunday-express1070/...

Politicians have different rules for themselves naturally enough: €zillions for the Kinnocks, Zil lanes for the likes of Presclot and bus lanes for their useful ----- agitators.

[TheDrBrian]

So has anyone actually proved their car has a lower load when cruising at higher speeds or are they still getting confused about no traffic/closed loop and lots of traffic/open loop acceleration?

[anonymous-user]

TheDrBrian said:

So has anyone actually proved their car has a lower load when cruising at higher speeds or are they still getting confused about no traffic/closed loop and lots of traffic/open loop acceleration?

it doesn't have a lower load.

I've done coastdowns (drag determination) on a large number of passenger cars, and tested an even greater number over tests where the load being run on the chassis dyno is set by coastdown data, and every single one, needs more energy to push it along the faster it goes.

IME, the most economic constant speed at which to drive is idle in top gear.

(in practice, where other traffic, hills and coasting / overrun become a factor, for most cars the lowest consumption occurs at around 1200rpm in top gear, typically just about 40 mph in most cars.


For example take the WLTP cycle fuel consumption vs the NEDC, where the average speed climbs from 33.4 kph (NEDC) to 46.5 kph (WLTP), and results (typically) in a 24% increase in consumption. (the WLTP cycle also includes a higher rate of acceleration, but this is not actually that much higher)