To answer question 2:
Yes there are speed limits, on the dirt roads outside the cities vehicles can go maximum 40 km/h
In the cities, there are limits because of curves and the type of road. Vehicles can drive only slowly over the old city roads from the 19th century.
But as then and in the 20th/21st Century, the modern roads, they have also limitations because of the size of the road.
So you can only achieve maximum speed with a vehicle on a straight, big 4-lane road with enough free space and no stops in front of the vehicle.
Thats why I don’t use the fastest vehicles in some cities, because they can never achieve their maximum speed and thus produce unnecessary maintenance costs.