Systems and methods for estimating traffic signal information
First Claim
1. A method of estimating traffic signal information and adjusting an operation of an on-board system of a vehicle, the method comprising:
- obtaining positioning system data from each of a plurality of vehicles, wherein said positioning system data for each of the plurality of vehicles comprises position and velocity of a vehicle as functions of time;
for an intersection having a traffic signal, estimating an average acceleration of the vehicles when leaving the intersection and an average deceleration of the vehicles when approaching the intersection;
for each of a subset of the vehicles, estimating a stop duration at the intersection based on an estimated stop time, an estimated start time, the average acceleration, the average deceleration, and the positioning system data for the respective vehicle;
removing vehicles from the subset for which the estimated stop time is greater than the estimated start time;
estimating a duration of a red phase of the traffic signal based on the stop duration of each of the subset of the vehicles; and
adjusting the operation of the on-board system of the vehicle based, at least in part, on the estimated red phase of the traffic signal.
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Abstract
Systems and methods for estimating traffic signal information are provided. According to one aspect, positioning system data is obtained from a plurality of vehicles. Each data set includes the position and the velocity of a vehicle as functions of time. For an intersection having a traffic signal, an average acceleration of the vehicles when leaving the intersection is estimated, and an average deceleration of the vehicles when approaching the intersection is estimated. For each of a subset of the vehicles, a stop duration at the intersection is estimated based on the average acceleration, the average deceleration, and the positioning system data for the respective vehicle. A duration of a red phase of the traffic signal is estimated based on the stop duration of each of the subset of the vehicles.
17 Citations
9 Claims
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1. A method of estimating traffic signal information and adjusting an operation of an on-board system of a vehicle, the method comprising:
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obtaining positioning system data from each of a plurality of vehicles, wherein said positioning system data for each of the plurality of vehicles comprises position and velocity of a vehicle as functions of time; for an intersection having a traffic signal, estimating an average acceleration of the vehicles when leaving the intersection and an average deceleration of the vehicles when approaching the intersection; for each of a subset of the vehicles, estimating a stop duration at the intersection based on an estimated stop time, an estimated start time, the average acceleration, the average deceleration, and the positioning system data for the respective vehicle; removing vehicles from the subset for which the estimated stop time is greater than the estimated start time; estimating a duration of a red phase of the traffic signal based on the stop duration of each of the subset of the vehicles; and adjusting the operation of the on-board system of the vehicle based, at least in part, on the estimated red phase of the traffic signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of estimating traffic signal information and adjusting an operation of an on-board system of a vehicle, the method comprising:
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obtaining positioning system data from each of a plurality of vehicles, wherein said positioning system data for each of the plurality of vehicles comprises position and velocity of a vehicle as functions of time; for an intersection having a traffic signal, estimating an average acceleration of the vehicles when leaving the intersection and an average deceleration of the vehicles when approaching the intersection; for each of a subset of the vehicles, estimating a stop duration at the intersection based on the average acceleration, the average deceleration, and the positioning system data for the respective vehicle; estimating a duration of a red phase of the traffic signal based on the stop duration of each of the subset of the vehicles; and adjusting the operation of the on-board system of the vehicle based, at least in part, on the estimated red phase of the traffic signal, wherein the subset of the vehicles is determined by; selecting vehicles whose positioning system data include data points within a distance interval surrounding the intersection, wherein at least a first one of the data points is before the intersection and at least a second one of the data points is after the intersection; removing vehicles whose velocity is lower, at a point either before the intersection or after the intersection, than a threshold; for each of the remaining vehicles, estimating an intersection delay based on the positioning system data for the respective vehicle; and removing vehicles whose estimated intersection delay is negative or zero. - View Dependent Claims (9)
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Specification