means at different motion
Travel at one speed for a period time e.g on a 30 mph road you would travel at a constant speed of 30 mph
It refers to people or animals who have no fixed home, but travel to different areas seasonally.
It simply means God speed you on your journey safely, or God be with you as your travel on your journey.
Moving to different positions.
It isn't clear at all what you mean. In any case, it isn't possible to travel at the speed of light - except for specific particles, such as photons (pieces of light), which can ONLY travel at the speed of light.
When people talk about Constant Speed, they mean non stopping speed at the same speed. For example if someone runs 10 miles at the same exact speed every day, people would say that he/she runs with constant speed.
mach 1 = the speed of sound mach 2 is twice the speed of sound and that's how fast Concorde could travel, well, mach 2.3
If you mean how fast does a tornado travel, the average forwards speed is about 30 mph, but it can range from 0 mph to over 70.
Its the Speed of which the flow travels, Water will travel faster than blood or yogurt
I assume you mean electromagnetic waves. In outer space, they will travel at the speed of light (since light is also an electrodynamic wave). This speed is about 300,000 kilometers per second.
Water waves - if that's what you mean - tend to travel at more or less the same speed, independent of their amplitude.
"Smarter travel" means a faster and safer means of moving around. For example, a car would be "smarter travel" compared to a bicycle because of higher speed and protection.