Method for determining dynamic speed limit value of highway road section based on visibility meter
A technology of visibility meter and dynamic speed limit, which is applied in the direction of instruments, arrangement of variable traffic indications, traffic control systems of road vehicles, etc., can solve problems such as unreasonable speed, impracticality, and inability for drivers to provide reasonable speed limit values. , to achieve the effect of reducing hidden dangers and improving driving safety.
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Embodiment 1
[0066] Select a test road section on the Hefei Ring Expressway, install and calibrate the visibility meter according to the relevant provisions of the "Forward Scatter Visibility Instrument Observation Specifications (Trial)", and carry out data return work through communication services. Due to the large number of cross-border vehicles in this test section, large trailer-type vehicles account for a large proportion of vehicle types, so dynamic speed limits are required.
[0067] Take the 10-minute average value of a certain period for example calculation, the visibility of this period is 100m, and the response time t is 2.5s. Of course, 2.5s is an ideal value. In practical applications, 3.0s can be selected for safety redundancy considerations. Referring to Table 1, the trailer-type large vehicles belong to the column of articulated trackless vehicles, so the vehicle braking deceleration can be selected as 4.5m / s 2 . Get the dynamic speed limit value v:
[0068] ...
Embodiment 2
[0073] Select another test section on the Hefei Ring Expressway, install and calibrate the visibility meter according to the relevant provisions of the "Forward Scatter Visibility Instrument Observation Specifications (Trial)", and carry out data return work through communication services.
[0074] Take the 10-minute average value of a certain period for example calculation, the visibility of this period is 50m, and the response time t is 2.5s. Due to the large proportion of small vehicles in this test road section, the value in the "Other Vehicles" column in Table 1 is taken when the vehicle brakes and decelerates, which is 5.0m / s 2 ; Of course, this value is the average deceleration that is fully released, that is, the braking deceleration when the brakes are stepped on. In practical applications, it can be properly set to a value lower than this value.
[0075] Through the calculation formula of the dynamic speed limit value v, it can be known that:
[0076] ...
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