1Milehigh wrote:
I always fount it difficult to go the way I wanted instead of the programs way
A GPS is an advisory tool. It isn't the law. Personally, I usually turn off Auto-Recalculation so that if I choose to turn a different way - the GPS doesn't think I'm stupid.
A GPS or a mapping program like Streets & Trips works from waypoint to waypoint. If you use S&T or a GPS to set a route - it will route from point to point - not via roadway XXX.
Another big problem for routing via a specific highway - the original source data from the various states breaks what should be a continuous highway into many small segments.
As an example - US-82 across Texas from Arkansas to New Mexico has no interstate sections except for a few miles in Wichita Falls - I have to set 5 waypoints near Texarkana where US-82 parallels closely with I-30 to force the route off I-30. S&T then draws the rest of the route very well.
However when you look at the detail driving directions - the contiguous highway is actually broken down into dozens of small segments. The longest actual Hwy-82 segment is only 128 miles for the 567 mile route.
The source data, and the S&T program, and any GPS sees each segment as a separate highway - not a continuation of the same highway.
I once mapped US-2 from west coast to east coast - it took close to 250 waypoints to force the route.