Third lane is for heavy traffic, trucks and due to that road condition on the third lane is not good, it's quite bumpy and uneven ...
it's perfectly fine to drive at 100 in the middle lane i think.
not everybody has a corolla or honda here, and 100 is pretty stable speed for smaller cars. try to realize their situation too... if you want to go too fast, 120 or more, use third lane.
aor agar ap ko bohat hi jaldi hai aor 100 walay log apko "flow" main rukawat lag rahay hain to bhai ap log car par safar na karain aor jahaz se chalay jain... woh apki car se bhi tez urta hai!!