Multilane vehicle information capture system
A system and method for accurate express tolling of highway vehicles. A multilane tolling system comprises a tolling (MVIC) unit that collects information from tolling subsystems arranged to take various vehicle measurements. Preferably, an intelligent vehicle identification subsystem sends vehicle information to the MVIC unit many times per second. Preferably, a vision tracking system (VTS) communicates with the MVIC unit and sends the latter information about the vehicle position using vision tracking sensors. Preferably, an RF subsystem conducts multiple reads of a transponder on a passing vehicle and forwards the read information to the MVIC unit. Preferably, a vehicle image capture unit (VICU) captures images of the passing vehicle when a camera in the VICU receives a trigger from the MVIC unit. Preferably, a driver alert module is used alert a driver passing through a tolling point as to account balance associated with a silent toll tag or pay by plate system.
1. A method for determination of a vehicle position in a multilane open road environment, comprising:
determining first vehicle position information with respect to a pair of adjacent lanes using a plurality of induction loop sensors;
determining second vehicle position information with respect to the pair of adjacent lanes using a multiple read RF system;
consolidating the first and second vehicle position information determined from the induction loop sensor and the multiple read RF system; and
making a final determination of the vehicle position with respect to the pair of adjacent lanes, based on a result of the consolidating step.
2. The method of claim 1 , wherein the loops sensors are arranged in loop sensor layouts within each of the adjacent lanes, each loop sensor layout containing a gradient sensor.
3. The method of claim 1 , wherein the multiple read RF system comprises a separate RF antenna for each of the adjacent lanes, each antenna used to conduct multiple RF reads of a transponder on the vehicle.
4. A method for determination of a vehicle position in a multilane open road environment, comprising:
determining first vehicle position information with respect to a pair of adjacent lanes using a plurality of induction loop sensors;
determining second vehicle position information with respect to the pair of adjacent lanes using a multiple read RF system;
consolidating the first and second vehicle position information determined from the induction loop sensor and the multiple read RF system;
determining third vehicle position information with respect to the pair of adjacent lanes using reports of activation of lane straddling sensors that straddle borders of adjacent lanes, including a border between the pair of adjacent lanes;
receiving fourth vehicle position information from a vision tracking system; and
making a final determination of the vehicle position with respect to the pair of adjacent lanes, based on a result of the consolidating step and the third and fourth vehicle position information.
5. The method of claim 2 , further comprising:
noting whether sensors in both adjacent lanes report entry/exit times; and
determining that the vehicle is not straddling between the pair of adjacent lanes if entry and exit times are not reported from gradient sensors in both lanes.
6. A method for determination of a vehicle position in a multilane open road environment, comprising:
determining first vehicle position information with respect to a pair of adjacent lanes using a plurality of induction loop sensors, wherein the loops sensors are arranged in loop sensor layouts within each of the adjacent lanes, each loop sensor layout containing a gradient sensor;
noting whether sensors in both adjacent lanes report entry/exit times;
determining that the vehicle is not straddling between the pair of adjacent lanes if entry and exit times are not reported from gradient sensors in both lanes;
if entry/exit times are reported from sensors in both of the pair of adjacent lanes, calculating a difference in entry/exit times between information recorded from sensors in each of the pair of adjacent lanes;
if the difference in entry/exit times is greater than a predetermined value for based on the vehicle traveling at a given vehicle speed, determining that the vehicle is not straddling between the pair of adjacent lanes;
determining second vehicle position information with respect to the pair of adjacent lanes using a multiple read RF system;
consolidating the first and second vehicle position information determined from the induction loop sensor and the multiple read RF system; and
making a final determination of the vehicle position with respect to the pair of adjacent lanes, based on a result of the consolidating step.
7. The method of claim 6 , further comprising:
if the difference in entry/exit times is less than a predetermined value, recording a range of vehicle speed reported; and
determining that the vehicle is not straddling between the pair of adjacent lanes, if the range of vehicle speed reported from each of the loop sensor layouts of the pair of adjacent lanes differs.
8. The method of claim 7 , further comprising:
if the range of vehicle speed reported from each of the loop sensor layouts of the pair of adjacent lanes is the same, recording a number of axles and axle spacing reported by the loop sensor layouts of each of the pair of adjacent lanes; and
determining that the vehicle is not straddling between the pair of adjacent lanes, if the number of axles and axle spacing reported by the loop sensors in each of the pair of adjacent lanes differs.
9. The method of claim 8 , further comprising:
if the number of axles and axle spacing reported by the loop sensors in each of the pair of adjacent lanes is the same, making a partial determination that the vehicle is straddling between the pair of adjacent lanes.
10. The method of claim 3 , further comprising:
noting whether RF data for the transponder on the vehicle is read from each RF antenna conducting RF reads on one of the adjacent lanes; and
determining that the vehicle is not straddling between the pair of adjacent lanes if data for the vehicle transponder is not reported from each RF antenna.
11. The method of claim 6 , further comprising:
if data for the vehicle transponder is reported from each RF antenna, calculating a number of times data is read using each RF antenna;
determining if the number of times data is read on one of the RF antennas is close to a corresponding number for the other RF antenna; and
determining that the vehicle is not straddling between the adjacent lanes if the number of times data is read on one of the RF antennas is not close to the corresponding number for the other RF antenna.
12. The method of claim 11 , further comprising making a partial determination that the vehicle is straddling between the adjacent lanes if the number of times data is read on one of the RF antennas is close to the corresponding number for the other RF antenna.
13. The method of claim 4 , further comprising:
determining how many lane straddling sensors are reported activated;
determining that the vehicle is not straddling between adjacent lanes if more than one lane straddling sensors are reported activated; and
determining that the vehicle is straddling between adjacent lanes if only a diamond sensor straddling the adjacent lanes is reported activated.