Besides driving, or being a passenger, I've clinched roads on a bike twice and in a golf cart. I've walked segments to clinch a route, but never walked an entire route. That needs to happen somewhere in Kentucky on one of those quarter-mile-long routes. Thanks for the idea.
The discussion on declinching is interesting. Rather than thinking of roads as declinched, I more optimistically look at them as reclinchable. If I truly clinch a road (i.e. travel from endpoint to endpoint), from that point forward it's clinched forever, unless one of the endpoints moves to a new location not previously on the road. So a route that's extended (ON 407) or rerouted at the end (US 175) gets removed from the clinched list, but a route that keeps its endpoints and is rerouted somewhere in between (such as US 61 south of Cape Girardeau) remains clinched. I still keep track of them in my .list, with a special entry at the end. The reclinchable segment of US 501 in Virginia, for example, shows up as
YYVA US501 *OldUS501_S *OldUS501_N
I prefer to keep this list short, so whenever I'm near one of them I will travel the new section and remove it from the reclinchable list. To avoid slightly exaggerating my mileage, if a reroute results in the addition of a business route over the former alignment (TX 31), I won't add the business route to my .list until I've travelled the new alignment.
This policy doesn't affect reroutes on unclinched highways. For example, US 6 was rerouted in Sterling, CO earlier this year. Since I'm still missing mileage on US 6 elsewhere, I deleted the rerouted segment from my .list.