No
Most new production does
Some off road and race machines have an AC voltage system
A lot of antique machines have Positive ground systems (North American Term)
No. A lot of cars in the 1960's had positive earth.
Most all vehicles built today have a negative ground system, and have had for decades.
no
All 50cc motorcycles and under
Most Motorcycles can stop better 95% of all cars
Most, though not all, motorcycles are air cooled and there for do not need a water tank.
Of course Australia has motorcycles. Cars, buses, motorcycles, trains, bicycles, trucks, utes, aeroplanes, etc - they are all used for transport in Australia. Motorcycles are also commonly used on farming properties.
No
Troposphere
the moon is the closest to the earth
don't let goats climb on rocks
by all he dust in the soler system