There are some people who know what top end means.
These are American gearheads, for whom flying down highways at breakneck speeds is recreation.
It's a stress reliever capped only by speed limits.
To these folks, speed limits are made to be broken.
In Colorado, that's 75 mph.
If you want to go a little faster and remain legal, consider Wyoming and Idaho.
Beginning in July, those two states will up the speed limit to 80 mph on those long, lonely stretches of highway where there isn't much to keep drivers from dozing off.
You know the roads.
They go on and on, ambulating for miles across the prairie, over hills and through tiny hamlets comprised of a post office and country store.
Languid, they are. Perfect for a short nap.
Two other states allow drivers to soar. Utah has a top speed limit of 75-80 and Texas, never to be outdone, has a top speed limit of 75-85 mph. It's 85 on the road between Austin and San Antonio.
Those who favored higher speeds in Idaho and Wyoming say it gets drivers through those long, monotonous ribbons of road quicker, and that increased speed doesn't necessarily equate to an increase in crashes.
Those against the proposals say that an 80 mph speed limit will mean that drivers will jet down highways at 85 under the truism that everyone really drives about 5 miles an hour over the posted speed limit.
For those who really want to speed, try the Isle of Man's rural roads, which have no speed limits.
Or try the Autobahn in Germany, where true speed freaks have neared 200 mph.
Bike and Byways Map
Spring is here and for those who ride bicycles, the fever is high.
So the Colorado Department of Transportation is making its Bike and Byways Map available as a mobile application, providing instant information.
While the hard-copy version of the map provides road data such as shoulder widths and traffic volumes, the electronic version will have more information. That will include the location of bike shops, restaurants and welcome centers, and directions, which will allow bike riders to get point-to-point directions.
The app also has street views, so users can see the road and determine if it fits their cycling abilities.
It also will provide alerts such as road closures and detours.