If you are riding a bike that's old enough to vote, it's unlikely that it has a factory-installed cruise control.
Although motorcycle cruise did not become common until the advent of ride-by-wire, there have been a few bikes that
had cruise many years ago. For the res of us, the need to shake out our throttle hand and arm is an ongoing challenge
on longer rides. I'm pretty sure we've all pulled in the clutch and coasted, or steered and throttled with our left
hand, but neither of those are optimal solutions. I personally started looking for throttle locks over 30 years ago.
While cruise control manipulates the throttle in an attempt to regulate the bike's speed to a chosen constant, a
throttle lock merely holds the throttle at a constant opening, allowing the vehicle speed to vary, sometimes
dramatically, based on load. Trying to use a throttle lock as a cruise control is an exercise in frustration in almost
every circumstance.
When purchasing a throttle lock, it is important to remember that while it is neither a cruise control, is it really a
throttle "lock", either. It is just a throttle-closing-resistive device. A truly locked throttle would be quite dangerous,
so the throttle lock must hold the throttle open with enough resistance to be useful, but without requiring excessive
force to close the throttle when needed.