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Besides signalling for at least 3 seconds, what must you do before changing to the lane on your left?
向左變道前，除至少提前3秒打燈，還必須怎麼做？
Check mirrors and your left blind spot, find a safe gap and give way to traffic in the lane you are entering.
查看後視鏡、轉頭檢查左側盲點，並確認有安全間距，給目標車道車輛讓行。
閱讀相關知識
The lane need not be empty, but you must not obstruct its users. Adjust speed smoothly; hazard or brake lights do not replace signalling and observation.
目標車道可以有其他車輛，關鍵是不能妨礙它們且有安全空隙。雙閃或剎車燈不能替代轉向燈與觀察；根據交通情況平穩調整車速。