Patent ID: 8823553

Claim:
Traffic detector ( 200 , 400 ) comprising: a hermetically closed tube ( 202 , 402 ); the said tube ( 202 , 402 ) delimiting at least one chamber ( 218 , 418 a , 418 b ), each chamber ( 218 , 418 a , 418 b ) extending from one of the ends of the said tube ( 202 , 402 ), for each chamber ( 218 , 418 a , 418 b ), a piezoelectric sensor placed at the corresponding end of the tube ( 202 , 402 ) and suitable for transforming the shock waves received into an electrical signal; the traffic detector ( 200 , 400 ) being characterised in that it comprises an elastic band ( 204 , 404 ) and fixing devices ( 208 , 210 , 410 a , 410 b ) intended to keep the said elastic band ( 204 , 404 ) tensioned between the ends'of the said tube ( 202 , 402 ).