long range distance tracking sensor for rfid based toll automation

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prasannac10

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friends to charge the toll amount based on distance travelled which sensor is usefull....
 

Hello,

You should be more specific (give us more details) to enable us to give you useful feedback.
 

i mean only short range(mm or cm) distance tracking sensors are available.,but v need a range of 30 to 50 meters...can v use speed sensor later v can measure distance using time..
 

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