You didn't cause the accident. However, you might have been wrong to slow down. I don't know where you live or exactly what the circumstances were, but this is

You didn't cause the accident. However, you might have been wrong to slow down. I don't know where you live or exactly what the circumstances were, but this is extremely common in the US, where people don't really know how to drive. It's ok to let someone out if: * they are waiting at a 1-way stop sign or uncontrolled junction and * traffic on the other side has stopped or slowed, so you are going to have to stop or slow down anyway. In that case, it's polite and efficient to let them out. Otherwise, barring some unusual circumstance, you should proceed. When you have the right of way, and it's safe to go, then go - that's the rule. Forcing everyone else to slow down or stop so that you can let someone out is not courteous or polite. And, as you have seen, there may be people who are not required to stop, and who are not parties to your little arrangement with the other driver. You would fail a driving test (in any country that has a serious driving test) if you make a habit of this. I want to reiterate that this doesn't make the accident your fault - and it may have been perfectly reasonable for you to slow down; I wasn't there.