Dear prefer to not drive at such speeds.
1st, the speed is quite high, and IMO, this speed is much more than the speed allowed on the Faisal Avenue a.k.a Islamabad Expressway, which is somewhere 80~90 kmph at max.
2nly, this is just a normal, urban sedan, and its braking, handling, road grip, etc. may not prove effective at such high speeds. GOD Forbid, something goes wrong, or something pops up on road suddenly out of nowhere (wild boar, truck, concrete blocks to stop / slow down traffic, etc.), then many things can go wrong.
I request, please drive at allowable speeds, and do not risk yourself, your car, loved ones, people who love you, etc.
And YES... An important thing: Yaris is not equipped with AT. Its equipped with rather CVT, which is altogether different from a conventional AT.