there really aren't any total road closures. The 10K tomorrow starts at 5:30 AM and is only in and around Epcot - so if you are trying to get to Epcot before 6:30, you might see some issues. The half marathon Sunday again starts at 5:30 and goes from Epcot to MK and back to Epcot. If you are going to MK super early, the road is open but there might still be a divided section with some of the later runners still heading toward MK. If going to Epcot, there might be some detours to get you in to the parking lot. You can see the race maps in the event guide at the RunDisney website.