As the weather cools,the track will be worked ( harrows going around) more often.
A lot of tracks will need to grade the track from the rail out every few days so the surface won't all go towards the inside. They try to keep the depth of the track the same.Most tracks that deal with more severe elements of weather, will grade on Fridays with a heavy grade and again with a lighter grade( amount of cushion being pushed back up towards the outside but not over the crown ( were the track peaks before it angles off towards the outside.You do not race there, only walk to and from the paddock) on Saturday.This is because typically, the races start earlier on Saturdays and it takes to long to move all that dirt.They can not start much before 10:30 AM because horses are still on the track exercising.So they do a little more Friday to help Saturday.
With the premier races being run on Saturday's and many more eyes on the results of those races,more so than races run during the week,Saturday is a day that is quite important to have the track fast and quick.
The result is that starting in the fall and most certainly in the winter the inside will have an advantage on Fridays. Not so much speed but horses that have inside trips.
If you do the .50 cent triples watch early on for some price horses 9-1 or better that stay inside the entire way and finish stronger than there form suggests and you have found something to work with.Maybe play whoever and put long shots under like,2,1345 or whatever.
Not saying it will happen today but especially on the east coast(Md.,N.Y.,C.T.,Phila.,etc.) it will happen because it has happened for the decades. Used to do it for a living.Did it a long time.
Good Luck and enjoy a fun day at the races.