A Series of Vertical Deflections, a Promising Traffic Calming Measure: Analysis and Recommendations for Spacing
Abstract
:Featured Application
Abstract
1. Introduction
- Vertical deflection: speed hump, speed bump, speed cushion, rumble strip, raised crosswalk, raised intersection, road lump and table.
- Horizontal deflection: curb-extension, chicane, gateway, raised median island, traffic circle
- Physical obstruction: semi and diagonal diverter; right-in and right-out island, raised median through intersections, street closure
- Signs and pavement markings.
2. Methodology and Case Study
2.1. Site Description
- Zachodnia Street. This street is the main street serving the housing estate with kindergartens and shops along it. The sequence of the controlled stretch has these traffic calming measures: raised intersection, raised intersection, speed cushion, raised crosswalk and raised intersections and the distances between the central point of the TCMs are 130 m, 127 m, 120 m and 190 m, respectively. Speed was measured in all the vertical TCMs (RI 1, RI 2, SC 3, RCW 4 and RI 5) and in the middle points (MP) between them (from MP 1–2 to MP 4–5) (Figure 2a).
- Wschodnia Street. This street is the main street in the single-family housing estate. The controlled stretch is composed of three successive speed humps, with long distance between them, 187 m and 293 m. The speeds were measured in the central speed hump (SH 2), in the intermediate points between speed humps (MP 1–2 and MP 2–3) and before SH 1, outside the calmed area (Outside), as a control point, more than 100 m away from the first speed cushion in order to see how drivers operate in non-calmed areas (Figure 2b).
- Pulaskiego Street. This street runs through the housing estate and has a collective function for nearby residents. The selected stretch is composed of three consecutive raised crosswalks, with short spaces between them of 114 m and 63 m. Speed measures were collected in the central raised crosswalk (RCW 2) and in the middle points between them (MP 1–2 and MP 2–3) (Figure 2c).
- Transportowa Street. This street runs on the outskirts of a housing estate and is an access road to the city’s bypass. In a part of this street there are three speed cushions in a sequence, with 150 m and 110 m between them. Measures were taken in the second and third speed cushions (SC 2 and SC 3), in the intermediate points (MP 1–2 and MP 2–3) and a point outside the calmed area (Outside) (Figure 2d).
- Eluterio Villaverde Street. This street makes a bypass of the neighborhood of San Miguel to avoid crossing the center of it, where various traffic lights are placed. In order to calm the traffic in this area, four raised crosswalks were displayed, with varying spacing between them: 165 m, 126 m and 150 m between the axes of the crosswalks. Speed data were collected in the four TCMs (from RCW 1 to RCW 4), in the intermediate points (MP 1–2, MP 2–3 and MP 3–4) and before the sequence (Outside) (Figure 3a).
- Gernika Street. This street is the main road of the neighborhood of San Miguel and in one extreme has two raised crosswalks. They were installed to calm the traffic before the traffic lights in the center of the neighborhood. The second raised crosswalk (RCW 2) works as a frontier between the interurban and the urban area. Measures were conducted in the middle point (MP 1–2), in the crosswalk that serves as the warning for entering the urban area (RCW 2) and in a point outside the urban area (Outside), at 110 m from RCW 2 (Figure 3b).
2.2. Speed Data for Analysis
2.3. Methodology for Model Development
3. Results and Discussion
3.1. Results in Poland
3.1.1. Zachodnia Street
3.1.2. Wschodnia Street
3.1.3. Pulaskiego Street
3.1.4. Transportowa Street
3.2. Results in Spain
3.2.1. Eluterio Villaverde Street
3.2.2. Gernika Street
3.3. Model Development
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Speed of Collision (km/h) | 80 | 65 | 50 | 32 |
Chance of Pedestrian Death (%) | 100 | 80 | 40 | 5 |
Type of TCM | Street | Point | Vmax (km/h) | V85 (km/h) | Vm (km/h) |
---|---|---|---|---|---|
Raised intersection | Zachodnia | RI 1 | 48 | 38 | 33.7 |
RI 2 | 40 | 35 | 32 | ||
RI 3 | 36 | 33 | 30.3 | ||
Mean values | 41.3 | 35.3 | 32.0 | ||
Raised crosswalk | Zachodnia | RCW 4 | 39 | 37 | 33.8 |
Pulaskiego | RWC 2 | 52 | 34 | 25.8 | |
Eluterio Villaverde | RCW 1 | 56 | 36 | 28.9 | |
RCW 2 | 48 | 33 | 27.9 | ||
RCW 3 | 53 | 38 | 29 | ||
RCW 4 | 56 | 42 | 34.6 | ||
Mean values | 50.7 | 36.7 | 30.0 | ||
Speed hump | Wschodnia | SH 2 | 39 | 21.2 | 16.8 |
Speed cushions | Zachodnia | SC 3 | 45 | 37 | 33.3 |
Transportowa | SC 2 | 72 | 36 | 26.4 | |
SC 3 | 60 | 31 | 21.7 | ||
Mean values | 59.0 | 34.7 | 27.1 | ||
Mean values of all TCMs | 49.5 | 34.7 | 28.8 |
Analyzed Model Type | R2 for V85 vs. Distance | R2 for Vm vs. Distance |
---|---|---|
Linear | 0.817 | 0.795 |
Logarithmic | 0.885 | 0.797 |
Inverse | 0.828 | 0.706 |
Quadratic | 0.875 | 0.799 |
Cubic | 0.899 | 0.856 |
Potential | 0.899 | 0.813 |
Exponential | 0.788 | 0.779 |
Source | Sum of Squares | Degrees of Freedom | Mean Squares | F Value | p-Value | Durbin- Watson | Root Mean Square Error | R |
---|---|---|---|---|---|---|---|---|
Model | 232.189 | 1 | 232.189 | 53.409 | <0.001 | 2.198 | 2.08504 | 0.904 |
Error | 52.169 | 12 | 4.347 | R2 | Adj. R2 | |||
Corrected total | 284.357 | 13 | 0.817 | 0.801 | ||||
Parameter estimates | Colinearity statistics | |||||||
Variable | Parameter estimate | Standard error | t value | p-value | 95% confidence limits | Tolerance | VIF | |
Intercept | 34.360 | 1.660 | 20.702 | <0.001 | 30.744 | 37.976 | ||
Distance | 0.0747 | 0.010 | 7.308 | <0.001 | 0.052 | 0.097 | 1.000 | 1.000 |
Source | Sum of Squares | Degrees of Freedom | Mean Squares | F Value | p-Value | Durbin- Watson | Root Mean Square Error | R |
---|---|---|---|---|---|---|---|---|
Model | 124.889 | 1 | 124.889 | 46.418 | < 0.001 | 1.333 | 1.64029 | 0.891 |
Error | 32.286 | 12 | 2.691 | R2 | Adj. R2 | |||
Corrected total | 157.175 | 13 | 0.795 | 0.777 | ||||
Parameter estimates | Colinearity statistics | |||||||
Variable | Parameter estimate | Standard error | t value | p-value | 95% confidence limits | Tolerance | VIF | |
Intercept | 30.670 | 1.306 | 23.489 | < 0.001 | 27.826 | 33.515 | ||
Distance | 0.055 | 0.008 | 6.813 | < 0.001 | 0.037 | 0.072 | 1.000 | 1.000 |
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Pérez-Acebo, H.; Ziółkowski, R.; Linares-Unamunzaga, A.; Gonzalo-Orden, H. A Series of Vertical Deflections, a Promising Traffic Calming Measure: Analysis and Recommendations for Spacing. Appl. Sci. 2020, 10, 3368. https://0-doi-org.brum.beds.ac.uk/10.3390/app10103368
Pérez-Acebo H, Ziółkowski R, Linares-Unamunzaga A, Gonzalo-Orden H. A Series of Vertical Deflections, a Promising Traffic Calming Measure: Analysis and Recommendations for Spacing. Applied Sciences. 2020; 10(10):3368. https://0-doi-org.brum.beds.ac.uk/10.3390/app10103368
Chicago/Turabian StylePérez-Acebo, Heriberto, Robert Ziółkowski, Alaitz Linares-Unamunzaga, and Hernán Gonzalo-Orden. 2020. "A Series of Vertical Deflections, a Promising Traffic Calming Measure: Analysis and Recommendations for Spacing" Applied Sciences 10, no. 10: 3368. https://0-doi-org.brum.beds.ac.uk/10.3390/app10103368