Not listening to doctors order?

Angila
I was told not to travel after this point in my pregnancy. However my sister is having her baby this week and she lives 4 hours (driving) away from me in VA. I don't think I would miss it for the world! 
Doctor said no traveling but I just have this strong itch to go! I will be 36 weeks. 
Being in a car for 4 hours isn't a big deal for me. 
Should I just go? 
Keep in mind she lost one of her twins and has no family in VA, just us in NJ.