利用方便携带式的雷达设备和电子显示版，义工们在住宅区特别是学校和儿童游戏场附近监测车速。
Using portable radar equipment and an electronic digital board, volunteers monitor speeds in neighbourhoods, particularly school and playground zones.
利用方便携带式的雷达设备和电子显示版，义工们在住宅区特别是学校和儿童游戏场附近监测车速。
Using portable radar equipment and an electronic digital board, volunteers monitor speeds in neighbourhoods, particularly school and playground zones.
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