GS300h SAT-NAV problem
 

This is my third GS300 (but the first hybrid). I have recently traded in my RX450h for this 2016 GS300h Premier with only FOURTEEN thousand miles on the clock. One owner and full Lexus service history from new. Stunning car BUT, my RX450h (and the previous GS300) both offered optional routes around traffic congestion (which had to be accepted or refused). This car doesn't offer any alternative routes, simply saying something like "warning, standing traffic in one mile". Not a lot of use at motorway speeds. Is there something I have to set in the SAT-NAV setup ? I can't see anything obvious and don't want to buy a smartphone just to get that feature on the phone (I only use the phone for hands-free calls).