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Warning traffic signs. Traffic signals ahead.,站酷海洛,一站式正版视觉内容平台,站酷旗下品牌.授权内容包含正版商业图片、艺术插画、矢量、视频、音乐素材、字体等,已先后为阿里巴巴、京东、亚马逊、小米、联想、奥美、盛世长城、百度、360、招商银行、工商银行等数万家
The first traffic signals were used for trains.The signals were put alongside railway tracks.The color red was used to mean "stop" because it warned people of danger.A red light was also the easiest color to see far away.Train drivers could see the red "stop" light ahead and had enough...
Porche, I., Lafortune, S., 1999. Adaptive look-ahead optimization of traffic signals. ITS Journal 4 (3-4), 209-254.Porche, I. and S. Lafortune. Adaptive Look-Ahead Optimization of Traffic Signals. Technical Report CGR 97-11. Department of Electrical Engineering and Computer Science, ...
go-ahead,green light- a signal to proceed red light- the signal to stop yellow light- the signal to proceed with caution Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc. Translations --- Select a language: Want to thank...
The signals were put alongside railway tracks(轨道).The color red was used to mean"stop"because it warned people of danger. A red light was also the easiest color to see from a distance.Train drivers could see the red"stop"light ahead and had enough time to slow down and stop their ...
The signals were put alongside railway tracks (轨道). The color red was used to mean "stop" because it warned people of danger. A red light was also the easiest color to see from a distance. Train drivers could see the red "stop" light ahead and had enough time to slow down and ...
The first traffic signals were used for trains.The signals were put along railway tracks(轨道).The color red was used to mean"stop"because it warned(警告) people of danger.A red light was also the easiest color to see from far away.Train drivers could see the red" stop" light ahead an...
The signals were put alongside railway tracks(轨道). The colour red was used to mean "stop" because it warned people of danger. A red light was also the easiest colour to see from a distance(从远处). Train drivers could see the red "stop" light ahead and had enough time to slow ...
The signals were put alongsiderailway tracks(轨道). The color red was used to mean “stop" because it warned peopleof danger. A red light was also the easiest color to see from a distance. Train driverscould see the red “stop" light ahead and had enough time to slow down and stop ...