If you depend on eye contact to know that a car will give you the right of way then don't. Some people, especially those not used to bicycles, will look you right in the eye and then hit you. They just don't correctly judge the speed of your bicycle in some cases.
A long time ago I was going down a hill here in the city. I was in the right lane of a four lane and moving pretty fast past a parking lot where a woman was pulling up to the road exiting the lot. She was going pretty slow and looked me right in the eye. I relaxed my guard and then rather than stop she sped up and pulled out in front of me. I hit her hood and flew over it and thankfully was not badly hurt. The front wheel of the bike was history.
She said she saw me but "thought she could make it".