Katy hated public restrooms and peeing any place other than a toilet; which was unfortunate for her weak bladder. She drove to best friends house a few hours away. The day she left it was boiling. After gulping four bottles of 8-ounce water, she left. It was only a two-hour drive. 45 minutes later she felt an urge to pee. "Whatever, I can hold it." She thought. Every minute or so she would clamp her urethra with her thighs, to keep in the liquid. Katy was at about a three so far. But all that water was catching up to her. Her friend lived in a suburban area, so it took a while to get to a proper highway. Katy turned onto a rough and uneven road. The shaking of the car and her unsteady wobbling body made her bladder twinge. She couldn't even spare a hand, or her car might go off the road. Her need instantly surged to a 5. Clamping her thighs, she hoped the hot urine wouldn't escape her. All she was wearing was a crop top, sandals, and a underwear with semi-light jeans. After a minute or two, the pressure became too much for her small bladder and weak pee-hole. A few drops of pee slithered out onto her pink panties. The wetness caused her urethra to spasm and let out even more droplets. "Fuck, come on you have 1 hour till you get home." A wet spot the size of a quarter had formed in her undies. Beads of piss continued to leak out. The dampness continued to grow. After five minutes the entire bottom of her panty was wet. Katy took deep breaths, willing her bladder to stay strong. A huge crevice in the rode had appeared. Too occupied with her bladder, she didn't notice it. The intense pressure and build up of urine did not go unnoticed. A hot spurt of piss escaped and went straight threw her damp undies. Her hand immediately went to her crotch. Her fingers squeezed her vagina and groin. Slightly moaning, she stopped the car to survey the damage. A stain the size of kiwi was on her pants. Her hand stayed stationary between her legs as she quickly began rushing. Now she realized she might not make it. "Only 55 minutes." Soon she found her self uncomfortably driving on the highway. Every bump, turn, and stop weighed heavily on Katy. Beads of sweat adorned her pale forehead and her breathing was fluctuating. The strain of needing to pee was so much worse driving. Katy was now a 7. She was desperate. Pulsing pee-hole, clamped thighs with a hand in between, jiggles, and of course biting her lip. She was going to lose it. Her bladder spasmed, and Katy sucked in a breath. Piss rapidly spurted out into the pants making the stain more noticeable. She squeezed as hard as she could, but it wasn't working. Another jet of pee leaked out. She managed to slowly stop it, but then she began dripping again. Pee dripped constantly, not stopping for a second. Katy let go to put on her turn signal and an instant dribble started. Soon a stream began. Just giving up, Katy peed her pants driving. The pee hissed down her pants and across her butt down the driver's seat. Her clit throbbed. She touched herself during the traffic jam. "Maybe I should do this more often."