回複：自行車該選哪種？Mountain, comfort or Road Bike?

I think you're referring the the hybrid bike category; for my situation, I think an affordable light road bike is good: I ride bike to work on good summer days for 14 miles one way daily, good enough for physical exercise. I choose a ~$400 road bike. It's not that bad on a 4~5 hrs ride over weekends. Multi-speed is almost a must. A road bike is faster but easy to get a flat; hybrid type is more comfy but heavier. Hope this can give you some help.
Happy biking, buddy, you'll like it.
BTW, never ride on highway or interstate or expressway, way too dangerous.