01627553

Component

Speed reducers are devices used in the roads in order to reduce the vehicle’s speed. However, the effects of such devices on the traffic flow are not yet entirely clear. Therefore, an analysis of the effect of geometry and spacing is made, through descriptive statistics and estimation of linear models; in the sense of pollutant emissions and fuel consumption. Considering as a case study, a collector street. The results indicate that the geometry is the most important for the effectiveness in decreasing the velocity factor; resulting in a decrease of 50% to 75% speed using circular geometry and from 10% to 65% speed reduction with trapezoidal geometry. The spacing between humps do not affect significantly the speed that vehicles will have when passing on these devices, but does influence pollutant emissions and extra fuel consumption depending on the geometry of humps, greater width decreases their efficiency in reducing speed, while the height of the device is the variable reflecting the greater significance in reducing speed. From the above, it is necessary to consider in its implementation the maximum speed in the spacing between reducers and what type and geometry of humps, since more acceleration - deceleration increases the amount of pollutant emissions and fuel consumption. .

This paper was sponsored by TRB committee AHB50 Standing Committee on Traffic Control Devices.

01618707

17-02065

English

17p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; References; Tables

Fuel consumption; Geometric design; Pollutants; Speed control; Speed control humps; Traffic flow

Highways; Operations and Traffic Management

Transportation Research Board Annual Meeting 2017 Paper #17-02065

TRIS, TRB, ATRI

Dec 8 2016 10:44AM