Two-Lane Highways Crest Curve Design. The Case Study of Italian Guidelines
The main purpose of the research is to evaluate the crest vertical curves radii R<sub>v</sub>, not considering a conventional value of the opposing vehicle height h<sub>2</sub>, but the average vehicle heights h<sub>2(m)</sub> and the value of the 15th percentile...
| الحاوية / القاعدة: | Applied Sciences |
|---|---|
| المؤلف الرئيسي: | |
| التنسيق: | مقال |
| اللغة: | الإنجليزية |
| منشور في: |
MDPI AG
2020-11-01
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| الموضوعات: | |
| الوصول للمادة أونلاين: | https://www.mdpi.com/2076-3417/10/22/8182 |
| _version_ | 1851835923332857856 |
|---|---|
| author | Marco Guerrieri |
| author_facet | Marco Guerrieri |
| author_sort | Marco Guerrieri |
| collection | DOAJ |
| container_title | Applied Sciences |
| description | The main purpose of the research is to evaluate the crest vertical curves radii R<sub>v</sub>, not considering a conventional value of the opposing vehicle height h<sub>2</sub>, but the average vehicle heights h<sub>2(m)</sub> and the value of the 15th percentile of the height distribution h<sub>2(15)</sub> of the passenger car population. The study only considered car models with more than 20,000 registered vehicles in Italy. One hundred and fifteen car models belonging to different brands were taken into consideration, for a total of over 9 million vehicles. For the statistical sample analyzed, the following vehicle heights were estimated: h<sub>2(m)</sub> = 1.48 m and h<sub>2(15)</sub> = 1.39 m. The deviations between the crest radii calculated with the Italian standard (h<sub>2</sub> = 1.10 m), and those obtained for h<sub>2(m)</sub> = 1.48 m and h<sub>2(15)</sub> = 1.39 m are up to 12%. The differences ΔH<sub>v</sub> between the values of the visible vehicle body height H<sub>v</sub> = H<sub>v</sub>(t) calculated using, respectively, h<sub>2(15)</sub> = 1.39 m and h<sub>2(m)</sub> = 1.48 m are modest. The value h<sub>2(m)</sub> = 1.48 m could be adopted in order to reduce the highways construction costs. In fact, the research shows that the value h<sub>2</sub> = 1.10 m is too conservative and leads to oversizing of the crest vertical curves. Therefore, it would be necessary to make an appropriate choice of h<sub>2</sub> value in order to take into account the current heights of passenger cars. |
| format | Article |
| id | doaj-art-ea14eddd104f4a0683c21219fb22308a |
| institution | Directory of Open Access Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| spelling | doaj-art-ea14eddd104f4a0683c21219fb22308a2025-08-19T22:30:22ZengMDPI AGApplied Sciences2076-34172020-11-011022818210.3390/app10228182Two-Lane Highways Crest Curve Design. The Case Study of Italian GuidelinesMarco Guerrieri0DICAM-Department of Civil, Environmental and Mechanical Engineering, University of Trento, 38122 Trento, ItalyThe main purpose of the research is to evaluate the crest vertical curves radii R<sub>v</sub>, not considering a conventional value of the opposing vehicle height h<sub>2</sub>, but the average vehicle heights h<sub>2(m)</sub> and the value of the 15th percentile of the height distribution h<sub>2(15)</sub> of the passenger car population. The study only considered car models with more than 20,000 registered vehicles in Italy. One hundred and fifteen car models belonging to different brands were taken into consideration, for a total of over 9 million vehicles. For the statistical sample analyzed, the following vehicle heights were estimated: h<sub>2(m)</sub> = 1.48 m and h<sub>2(15)</sub> = 1.39 m. The deviations between the crest radii calculated with the Italian standard (h<sub>2</sub> = 1.10 m), and those obtained for h<sub>2(m)</sub> = 1.48 m and h<sub>2(15)</sub> = 1.39 m are up to 12%. The differences ΔH<sub>v</sub> between the values of the visible vehicle body height H<sub>v</sub> = H<sub>v</sub>(t) calculated using, respectively, h<sub>2(15)</sub> = 1.39 m and h<sub>2(m)</sub> = 1.48 m are modest. The value h<sub>2(m)</sub> = 1.48 m could be adopted in order to reduce the highways construction costs. In fact, the research shows that the value h<sub>2</sub> = 1.10 m is too conservative and leads to oversizing of the crest vertical curves. Therefore, it would be necessary to make an appropriate choice of h<sub>2</sub> value in order to take into account the current heights of passenger cars.https://www.mdpi.com/2076-3417/10/22/8182two-lane highwayscrest vertical curveshighways designpassing sight distance (PSD) |
| spellingShingle | Marco Guerrieri Two-Lane Highways Crest Curve Design. The Case Study of Italian Guidelines two-lane highways crest vertical curves highways design passing sight distance (PSD) |
| title | Two-Lane Highways Crest Curve Design. The Case Study of Italian Guidelines |
| title_full | Two-Lane Highways Crest Curve Design. The Case Study of Italian Guidelines |
| title_fullStr | Two-Lane Highways Crest Curve Design. The Case Study of Italian Guidelines |
| title_full_unstemmed | Two-Lane Highways Crest Curve Design. The Case Study of Italian Guidelines |
| title_short | Two-Lane Highways Crest Curve Design. The Case Study of Italian Guidelines |
| title_sort | two lane highways crest curve design the case study of italian guidelines |
| topic | two-lane highways crest vertical curves highways design passing sight distance (PSD) |
| url | https://www.mdpi.com/2076-3417/10/22/8182 |
| work_keys_str_mv | AT marcoguerrieri twolanehighwayscrestcurvedesignthecasestudyofitalianguidelines |