US 12,243,424 B2
Vehicle flow monitoring system
Donald H. Sandbrook, Palmerston North (NZ)
Assigned to Frogparking Limited, Palmerston North (NZ)
Filed by Frogparking Limited, Palmerston North (NZ)
Filed on Mar. 28, 2024, as Appl. No. 18/620,026.
Application 18/620,026 is a continuation of application No. 18/317,682, filed on May 15, 2023, granted, now 11,948,458.
Application 18/317,682 is a continuation of application No. 17/975,840, filed on Oct. 28, 2022, granted, now 11,798,414, issued on Oct. 24, 2023.
Application 17/975,840 is a continuation of application No. 17/502,895, filed on Oct. 15, 2021, granted, now 11,488,475, issued on Nov. 1, 2022.
Application 17/502,895 is a continuation of application No. 16/750,244, filed on Jan. 23, 2020, granted, now 11,151,874, issued on Oct. 19, 2021.
Prior Publication US 2024/0242608 A1, Jul. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G08G 1/14 (2006.01); G01S 17/88 (2006.01)
CPC G08G 1/141 (2013.01) [G01S 17/88 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for counting vehicles comprising:
obtaining, with a first distance sensor directed towards a position of interest, a first measurement of distance between the first distance sensor and the position of interest and transmitting a first signal representative of the first measurement;
obtaining, with a second distance sensor directed towards the position of interest, a second measurement of distance between the second distance sensor and the position of interest, and transmitting a second signal representative of the second measurement;
responsive to receiving the first signal, comparing the first measurement to a first distance threshold value and, responsive to receiving the second signal, comparing the second measurement to a second distance threshold value;
determining that a vehicle has obstructed the position of interest when both the first measurement is less than the first distance threshold value and the second measurement is less than the second distance threshold value; and
determining that a vehicle has not obstructed the position of interest when either the first measurement is greater than the first distance threshold value or the second measurement is greater than the second distance threshold value.