Weird way of girls checking you out?

[Bigjo]

I was on a motorbike with my friend(female) driving it and I was on the back and it was jam packed, there were 3 ladies who came out of the mall and while stuck in traffic I felt one of the ladies touched my calves probably near the knee and I kept looking at her after some few minutes she turned back and looked in my direction, I don't know if it was her purse and she did it deliberately and did she turn around just to look for a vacant cab. I don't know if this was her way of checking me out or what, I am very curious to hear your thoughts