Road-Trip Ramblings #1: The 2-Hour Bladder

Welcome to the beginning of a new series on A Local Wander where I'll share random observations, tips, and questions that come up while I'm out on the road...

Image Source: By Colin from Los Angeles, USA 
(http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons
Less than 3 hours to make it on the road today; this should be a piece of cake!  
3:30  Send B & P to the bathroom, load into the car, and finish the last minute errands before leaving  town for the week
5:00 Get to soccer practice and P needs to go to the bathroom again
6:00 Soccer is over.  B & P head to the potty one more time before we hit the road
6:45 5 miles out of Park City and P already needs to go the bathroom.  It was hot today and I know he didn't get enough water while he was outside playing, so I have no idea where all this is coming from.
6:55 Pull into a gas station less than 1 hour from home.  This does not bode well.  Wondering if P's just over exaggerating how badly he needs to go, but, no, those 3-year-old legs are clenched together as tight as they can be!
8:15 5 miles away from the hotel and little P is back to squirming.  
8:30 Pull into the hotel lobby and go to get the keys.  Completely forget that P needs to pee.  My mistake.  10 minutes later B & P come running into the lobby in an almost emergency.  B goes back out to sit with the babies while I run P to the closest restrooms.
8:35 Into our rooms and the rest of the night P miraculously seems to be tinkle free...

Road-tripping with a newly potty-trained 3-year-old...keeps the journey interesting...He's so good at patiently waiting to his limit and we try to stay attuned to his little body's schedule.  That doesn't mean we haven't spent our fair share of time stopped along side the road, but I'm thinking I-80 in the middle of Wyoming might not be the safest place for that tomorrow.  Preparing now for the extra time it takes for potty breaks...

What tips do you have for traveling with a potty-training newbie?