Back in high school I had a 84 civic hatchback. I lowered it on a sat and drove it all day sun with no issues. I made it into the school parking lot with no issues(entrance had no speed bumps) after school me and my 3 friends got into my car to leave. As I went over the first of 3 speed bumps my car stopped and wouldn't move forward or backwards. So my 3 friends climb out and I made it over the 3 speed bump with a lot of vary bad noises cumming from under the car. I had to decide to raise it back up of just park in the lower lot to bypass the speed bumps. My car stayed low.

When I had my Mitsubishi Cordia Turbo I lowed it and I got stuck on the top of a speed table at the mall. Front tires would just spin. Luckily I was with a group of people and they stopped and helped me get over it.
Also when I owned my Mitsubishi I intstalled a body kit and a front mount intercooler and was still lowered. On my way to school one morning I scooped up a chicken and it go stuck in my grill up against the intercooler. I backed my car into my spot and didn't notice it until that afternoon after school got out. As I walked up to it I was like WTF is in my grill. LOL

When I had my CRX it was lowered and I had just installed my VW lip and 2 weeks later I was backing out of a friends drive way and it hit. Didn't think about it and when home. Next day I noticed a 1/4 of the lip was missing.

Now I own a 4" lifted Jeep and a stock ride height Celica so no more getting stuck on speed bumps for me.