The Eighth Amendment of the U.S. Constitution and Art. 1, Sec 12(c) of the California Constitution, each provides that excessive bail shall not be required. Although drivers rarely do so, they have a constitutional right to appear in court and ask for a bail hearing. Assuming that you can convince the court that the bail is excessive, the court would be required to reduce or eliminate that bail.
I admit that I have never known of anyone to actually request reduced bail from the court for an ordinary traffic citation, but it's legal to do so, should you desire to try.
So, the answer here is, "yes," it's legal to require bail in the amount of the citation -- but, it's also legal to request a hearing and ask for a bail reduction or elimination.
Hope this helps.
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