System for detecting the crossing of a bicycle on a traffic route, said detection system including: a primary set of coils (102a-d, 202a-d), of rank 1 to N, where N>1, arranged in a particular layout, at least one secondary set of coils (104a-d, 204a-d), of rank 1 to N, arranged in the same particular layout, and each coil (104a-d, 204a-d) of rank n (1≤n≤N) of said secondary set is in the same location in the particular layout as the coil (102a-d, 202a-d) of the same rank n (1≤n≤N) of the primary set , a primary power supply and measurement device connected electrically to each coil (102a-d, 202a-d) of the primary set so as to supply electric power successively to each of said coils (102a-d, 202a-d) with an activation period of TO between two successive coils and measure their inductances and compare the measured inductances with reference inductances measured without disturbance, for each secondary set , a secondary power supply and measurement device connected electrically to each coil (104a-d, 204a-d) of said secondary set so as to supply electric power successively to each of said coils (104a-d, 204a-d) with the activation period of TO between two successive coils and measure their inductances and compare the measured inductances with reference inductances measured without disturbance, and a storage device connected to the primary power supply and measurement device and to each secondary power supply and measurement device , and designed to regularly recover information relating to the number of bicycles detected by each set , said detection system being characterized in that each secondary power supply and measurement device is synchronized with the primary power supply and measurement device so as to supply power simultaneously to the coil of rank 1 of the primary set and the coil of rank 1 of each secondary set and in that the coils of the two sets are disposed in an aligned manner to cover the entire width of the traffic route. a primary set of coils (102a-d, 202a-d), of rank 1 to N, where N>1, arranged in a particular layout, at least one secondary set of coils (104a-d, 204a-d), of rank 1 to N, arranged in the same particular layout, and each coil (104a-d, 204a-d) of rank n (1≤n≤N) of said secondary set is in the same location in the particular layout as the coil (102a-d, 202a-d) of the same rank n (1≤n≤N) of the primary set , a primary power supply and measurement device connected electrically to each coil (102a-d, 202a-d) of the primary set so as to supply electric power successively to each of said coils (102a-d, 202a-d) with an activation period of TO between two successive coils and measure their inductances and compare the measured inductances with reference inductances measured without disturbance, for each secondary set , a secondary power supply and measurement device connected electrically to each coil (104a-d, 204a-d) of said secondary set so as to supply electric power successively to each of said coils (104a-d, 204a-d) with the activation period of TO between two successive coils and measure their inductances and compare the measured inductances with reference inductances measured without disturbance, and a storage device connected to the primary power supply and measurement device and to each secondary power supply and measurement device , and designed to regularly recover information relating to the number of bicycles detected by each set , said detection system being characterized in that each secondary power supply and measurement device is synchronized with the primary power supply and measurement device so as to supply power simultaneously to the coil of rank 1 of the primary set and the coil of rank 1 of each secondary set and in that the coils of the two sets are disposed in an aligned manner to cover the entire width of the traffic route. <EOS>