What does "hitting the roadblock" mean? Is it a metaphor?

Native speaker’s answer
Rebecca
To "hit a roadblock" is a common phrase to mean that something prevents you from continuing with an action or making progress! It is a kind of metaphor. It comes from when you're driving, and then something blocks the road so you can't continue. Here "the" comes from the phrase "the most," meaning the largest possible amount. Ex: I kept hitting roadblocks whenever I tried to change a regulation at the school. Ex: The business takeover has hit a roadblock. Ex: She's going to hit a few roadblocks on the way to becoming successful. Ex: They bought the most stickers from us.