If you are like me, and like to review your route and prepare for it, especially in an unfamiliar place, sudden route changes that can save you 5 minutes can cause more trouble than it's worth. Let's add an option to "lock route" once you chose it and start driving, and don't recommend a quicker one unless I deviate from the preset route. This keeps you more comfortable on the route you have prepared for, so you don't have to worry about sudden changes in unfamiliar territory.