回复：我准备下周出庭，罚单上说是walk in。这样的case警察不用出庭么？

很抱歉老貓沒有參與過您所在州的交通庭的審判流程,但是老貓懷疑您所說的可能是 walk in traffice school.

相關法庭審理的問題,請您參考這個資料

http://www.courtinfo.ca.gov/selfhelp/traffic/common.htm

For most infractions you can send a letter to your court asking for a court trial or a trial by mail (also called a "trial by written declaration"). You'll have to pay the bail even if you want to have a trial. Send your letter by certified or registered mail, at least 5 days before the "appearance date" on your ticket.