Yes they man any Emergency or responce vehicle can.
They are allowed to exceed the speed limit when Lights and siren are all on.
Slow down to half the posted speed limit.
It is never legal to go above the posted limit. Even when passing a vehicle. That's called an absolute speed law. Only emergency vehicles responding to an emergency may exceed the limit and then only when "reasonable".
The speed limit for vehicles merging onto the highway from an on ramp is typically the same as the posted speed limit for that section of the highway.
There currently is not.
All vehicles get the speed limit on the road, whether it is a motorcycle motorbike or whatever, it it is a vehicle it has a speed limit.
Add a governor to limit the speed of the engine or vehicle.
No. It is never legal to exceed speed limits, except in the instance of emergency vehicles responding to a callout. The moment you go 1 MPH over the speed limit, you're in violation.
An emergency vehicle is any vehicle that is designated and authorized to respond to an emergency. These vehicles are usually operated by designated agencies, often part of the government, but also run by charities, non-governmental organizations and some commercial companies. Often emergency vehicles are permitted by law to break conventional road rules in order to reach their destinations in the fastest possible time, such as (but not limited to) driving through an intersection when the traffic light is red, or exceeding the speed limit. In some states, however, the driver of an emergency vehicle can still be sued if the driver shows "reckless disregard for the safety of others.
They go the speed limit
100 km
They are not allowed to exceed speed limits