On I-70 around mile marker 40, a woman was tail-gating me so close that I couldn't see her headlights. She passed me on the right, flipped me off and cut around, then slammed on her brakes. I laid on the horn because there was a car behind me as well. She kept this up for a bit and eventually drove ahead in the fast lane. Later on I-675, she was in front of me and pulled over to the right, slowed down, and honked twice to get my attention. I ignored her. She sped up in her lane then slowed down again as she was approaching her exit 17. She rolled down the window. I don't know what she said, but I think she flipped me off again.