XL Live IQ does not give fastest route

[MMN]

My TomTom is set to the fastest route; maps are up-to-date; I am traveling in the Netherlands (Live service provided) on back roads where I am very familiar with the lay-out. At a T-junction it tells me to go right (ETA 15:44) which is the long and slow way around. I turn left. Immediate recalculation. Now the ETA is 15:42!! What is going on here? Am I missing something or does my TomTom Live IQ have rigor mortis or a low IQ? Can anybody enlighten me? Thanks! (By the way tags like XL and IQ are not accepted as being too short)

 

[mvl]

Perhaps there is an incorrect turn restriction on the map. Do a prepare route from immediately before the left to immediately after it, and see if the Tomtom will take the turn.

 

[gatorguy]

The fact you can occasionally find a faster route than the computed one isn't unheard of. There is no consumer device that can sample every possible road combination for every route. There's a trade-off for fast calculation. I don't know of anyone who's used a pnd for any length of time that hasn't seen the estimated time of arrival fall at some time when taking a "detour" from the recommended route. It happens.

 

[MMN]

Again

I accept that at times one can find a "better" route than proposed by a SatNav. My point was, and I had the same experience at that very same intersection every time, that not only did I find a better route, but ( and this is very important) my TomTom agreed with me *afterwards*! So why does it not suggest the better route in the first place, as apparently it is not a freak occurrence?

 

[MMN]

I checked it as you suggested. My TomTom did not object to taking that turn. Thanks for the suggestion.

 

[mvl]

Usually with IQroutes, the detours rarely find a better route. One exception is a small-road-class issue which the routes algorithm causes problems on. If you post the location of the turn, I can tell you what's going on.