Approaches to Improving Geometric Configurations and Level of Service of Intersections under Low-Volume Conditions
The research examines a case study carried out in the Southern Italy where at-grade three-leg and four-leg intersections with stop control on the minor roads were investigated from the point of view of level of service LOS and crash phenomena. The main scope is to explore how a set of methods can be...
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ftunivnapoliiris:oai:www.iris.unina.it:11588/677705 2024-06-23T07:56:25+00:00 Approaches to Improving Geometric Configurations and Level of Service of Intersections under Low-Volume Conditions RUSSO, FRANCESCA Biancardo, Salvatore Antonio MANCINI, LAURA ESPOSITO, MANUELA FESTA, BRUNA Vetrano, Emanuela Transportation Research Board Russo, Francesca Vetrano, Emanuela Biancardo, Salvatore Antonio Mancini, Laura Esposito, Manuela Festa, Bruna 2017 http://hdl.handle.net/11588/677705 http://amonline.trb.org/ eng eng Transportation Research Board country:USA place:Washington, DC 20001 ispartofbook:TRB 96th Annual Meeting Compendium of Papers TRB 96th Annual Meeting Compendium of Papers firstpage:1 lastpage:12 numberofpages:12 alleditors:Transportation Research Board http://hdl.handle.net/11588/677705 http://amonline.trb.org/ info:eu-repo/semantics/conferencePaper 2017 ftunivnapoliiris 2024-06-10T14:58:50Z The research examines a case study carried out in the Southern Italy where at-grade three-leg and four-leg intersections with stop control on the minor roads were investigated from the point of view of level of service LOS and crash phenomena. The main scope is to explore how a set of methods can be applied sequentially to check whether improvements to LOS, in terms of control delays and 95th percentile of the queues length distribution, and safety, in terms of number of expected crashes during a study period, can be achieved by improving the existing geometric configurations. The intersections investigated belong to a two-lane rural road network under low-volume conditions and they are located on a flat-rolling terrain. They have been built before National Standard became law. A total of 89 typical intersections were investigated and 550 crashes were observed over a period of 5 years (2005-2010). As first step, a crash level was associated with each site according to methodology based on the crash rate evaluation. Further step was focused on main three intersections characterized by high crash rate level. Comparisons in terms of LOS and number of crashes were carried out between existing configurations and new geometric solutions (I option: adjustment of the existing intersections to Standards by adopting left-turn lanes, right-turn lanes, median-refuge islands, lighting; II option: changing the shape into a roundabout). The results confirmed that both geometric solutions are reliable to improve LOS and reduce the crash cost but the roundabout is the best solution. Conference Object Refuge Islands IRIS Università degli Studi di Napoli Federico II Lanes ENVELOPE(18.933,18.933,69.617,69.617) Refuge Islands ENVELOPE(-67.166,-67.166,-68.350,-68.350) |
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IRIS Università degli Studi di Napoli Federico II |
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ftunivnapoliiris |
language |
English |
description |
The research examines a case study carried out in the Southern Italy where at-grade three-leg and four-leg intersections with stop control on the minor roads were investigated from the point of view of level of service LOS and crash phenomena. The main scope is to explore how a set of methods can be applied sequentially to check whether improvements to LOS, in terms of control delays and 95th percentile of the queues length distribution, and safety, in terms of number of expected crashes during a study period, can be achieved by improving the existing geometric configurations. The intersections investigated belong to a two-lane rural road network under low-volume conditions and they are located on a flat-rolling terrain. They have been built before National Standard became law. A total of 89 typical intersections were investigated and 550 crashes were observed over a period of 5 years (2005-2010). As first step, a crash level was associated with each site according to methodology based on the crash rate evaluation. Further step was focused on main three intersections characterized by high crash rate level. Comparisons in terms of LOS and number of crashes were carried out between existing configurations and new geometric solutions (I option: adjustment of the existing intersections to Standards by adopting left-turn lanes, right-turn lanes, median-refuge islands, lighting; II option: changing the shape into a roundabout). The results confirmed that both geometric solutions are reliable to improve LOS and reduce the crash cost but the roundabout is the best solution. |
author2 |
Transportation Research Board Russo, Francesca Vetrano, Emanuela Biancardo, Salvatore Antonio Mancini, Laura Esposito, Manuela Festa, Bruna |
format |
Conference Object |
author |
RUSSO, FRANCESCA Biancardo, Salvatore Antonio MANCINI, LAURA ESPOSITO, MANUELA FESTA, BRUNA Vetrano, Emanuela |
spellingShingle |
RUSSO, FRANCESCA Biancardo, Salvatore Antonio MANCINI, LAURA ESPOSITO, MANUELA FESTA, BRUNA Vetrano, Emanuela Approaches to Improving Geometric Configurations and Level of Service of Intersections under Low-Volume Conditions |
author_facet |
RUSSO, FRANCESCA Biancardo, Salvatore Antonio MANCINI, LAURA ESPOSITO, MANUELA FESTA, BRUNA Vetrano, Emanuela |
author_sort |
RUSSO, FRANCESCA |
title |
Approaches to Improving Geometric Configurations and Level of Service of Intersections under Low-Volume Conditions |
title_short |
Approaches to Improving Geometric Configurations and Level of Service of Intersections under Low-Volume Conditions |
title_full |
Approaches to Improving Geometric Configurations and Level of Service of Intersections under Low-Volume Conditions |
title_fullStr |
Approaches to Improving Geometric Configurations and Level of Service of Intersections under Low-Volume Conditions |
title_full_unstemmed |
Approaches to Improving Geometric Configurations and Level of Service of Intersections under Low-Volume Conditions |
title_sort |
approaches to improving geometric configurations and level of service of intersections under low-volume conditions |
publisher |
Transportation Research Board |
publishDate |
2017 |
url |
http://hdl.handle.net/11588/677705 http://amonline.trb.org/ |
long_lat |
ENVELOPE(18.933,18.933,69.617,69.617) ENVELOPE(-67.166,-67.166,-68.350,-68.350) |
geographic |
Lanes Refuge Islands |
geographic_facet |
Lanes Refuge Islands |
genre |
Refuge Islands |
genre_facet |
Refuge Islands |
op_relation |
ispartofbook:TRB 96th Annual Meeting Compendium of Papers TRB 96th Annual Meeting Compendium of Papers firstpage:1 lastpage:12 numberofpages:12 alleditors:Transportation Research Board http://hdl.handle.net/11588/677705 http://amonline.trb.org/ |
_version_ |
1802649500705095680 |