Indiana

This be somewhat of a stupid question but is there an exact speed limit for the fast lane on the highway? I was hitting 20 higher to 50 over. Though even if a police officer saw me driving too fast in the fast lane. Will they pull me over just for the speed or will it also matter at the handling of the car. Since like if I was changing lanes I’d do a really long sway to the side unless I have to sharpen it. Then I barely have to move my steering wheel and one hand while keeping it perfectly steady at 100 mph. It felt the same as going 40-50 mph to me.