Evaluating Pedestrians' Safety on Urban Intersections

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Evaluating Pedestrians' Safety on Urban Intersections sustainability Article Evaluating Pedestrians’ Safety on Urban Intersections: A Visibility Analysis Keila González-Gómez * and María Castro Departamento de Ingeniería del Transporte, Territorio y Urbanismo, Universidad Politécnica de Madrid, 28040 Madrid, Spain; [email protected] * Correspondence: [email protected]; Tel.: +34-910-674-215 Received: 17 October 2019; Accepted: 21 November 2019; Published: 23 November 2019 Abstract: Overall visibility plays a key role in the safety of pedestrians. Despite its importance, verifying the right provisioning of sufficient available sight distances among pedestrians and vulnerable road users (VRUs) is not a prevalent practice. On top of that, the pursuit for more sustainable modes of transportation has promoted the establishment of different shared mobility services which are prone to increase walking and, thus, the number of pedestrians and other VRUs in urban settings. With the intention of verifying how car-centered designs perform for non-motorized users, a 3D procedure that evaluates the visibility of pedestrians and other users is presented and applied to specific cases in Madrid, Spain. The proposed solution employs virtual trajectories of pedestrians with mobility impairments and without them, cyclists, and personal transportation device riders. Their visibility was assessed around the functional area of urban intersections, including zones where possible jaywalking practices might occur. The evaluation was performed three-dimensionally, making use of LiDAR data, GIS tools, and 3D objects. Results show the impact of street furniture location on visibility, the distinctive influence of vegetation on the lines of sight of each observer, and how design parameters that were intended to improve motorized traffic could affect VRU. Keywords: vulnerable road users; urban intersections; sight distance; road safety; LiDAR models 1. Introduction Walking, cycling, and riding are fundamental to the expansion of sustainable transportation, either used alone or in combination with other types of motorized transport (public transit, private ownership, carsharing, ridesourcing, etc.) [1]. In that sense, the widely adopted tendency of increasing public transit provision and the proliferation of shared mobility services are likely to augment the need for walking and, thus, the number of pedestrians and other vulnerable road users (VRU) in the urban scene [2]. Different bikesharing, motosharing, and shareable electric scooter services have flooded many cities around the world, attracting new users, whether for fun or convenience, with different levels of riding or biking expertise. This trend has altered regular commuting and recreation routes, as well as created new ones [3]. These new users have to coexist with motorized traffic, and they all possess different decision and reaction times, capabilities, speeds, etc. To create safer environments for these dissimilar users, many road authorities have applied different road safety policies, such as speed reductions, traffic calming interventions, among others [4]. Data from Spain’s General Directorate of Traffic show that from 2008 to 2017 accidents with victims increased 3% in urban roads, while rural areas saw a decrease of 2%. Most accidents with victims occurred in urban settings, specifically in streets, with pedestrians constituting 51% of road deaths [5]. Globally, VRUs constitute more than half of the fatalities that occur in all road traffic accidents [6]. For many decades there have been several efforts, from different approaches and fields of knowledge, that aim at decreasing road traffic deaths [7]. From this wide array of studies, some intend to establish Sustainability 2019, 11, 6630; doi:10.3390/su11236630 www.mdpi.com/journal/sustainability Sustainability 2019, 11, x FOR PEER REVIEW 2 of 16 accidents [6]. For many decades there have been several efforts, from different approaches and fields Sustainabilityof knowledge,2019, 11that, 6630 aim at decreasing road traffic deaths [7]. From this wide array of studies, 2some of 16 intend to establish the relationship between road alignment and profile elements with the occurrence and severity of road accidents [8,9]. Traditionally, the main factors contributing to traffic accidents theare relationshiptackled according between to road the respective alignment andelements profile of elements the road with system the occurrencethey fall into and (vehicle, severity user, of road or accidentsinfrastructure). [8,9]. Traditionally, Some research the focuses main factors on the contributing psychological to aspects traffic accidents behind th aree behavior tackled according of the main to theroad respective users. This elements is due to of the fact road that system human-rela they fallted into factors (vehicle, are user, the ones or infrastructure). involved in a higher Some research number focusesof road onconflicts the psychological and accidents aspects [5]. Efforts behind that the behaviorfocus on ofimproving the main roadthe planning users. This and is design due to theof safer fact thatroad human-related infrastructures factors have undergone are the ones paradigm involved inshifts. a higher Some number of the latest of road approaches conflicts and are accidentsan advocacy [5]. Eforfforts roads that that focus are on forgiving improving of theinevitable planning human and design errors of and safer road road infrastructures infrastructures and have surrounding undergone paradigmelements shifts.that meet Some the of theneeds latest of approachesall road users, are anfrom advocacy the most for roadsvulnerable that are to forgiving the least of vulnerable, inevitable humanamong errorsother principles and road infrastructures [6,10,11]. and surrounding elements that meet the needs of all road users, fromThe the mostcomplexity vulnerable of urban to the agglomerations least vulnerable, resides among in othertheir multiple principles destinations [6,10,11]. and their need to deliverThe accessibility complexity ofto urbana wide agglomerations range of dissimilar resides users. in their Urban multiple intersections destinations add to and this their complexity need to deliverwith their accessibility variety of to movements, a wide range including of dissimilar conflictive users. ones Urban [12]. intersections In this regard, add by to thisproviding complexity these withroad their sections variety with of sufficient movements, intersection including sight conflictive distances ones (ISD), [12]. Indesigners this regard, intend by providingto provide these motorists road sectionswith the with capability sufficient of efficiently intersection recognizing sight distances potentially (ISD), conflicting designers intend vehicles, to providephysical motorists elements, with and theVRUs capability outside ofthe effi roadwayciently recognizingor about to enter potentially it. Alon conflictingg with the vehicles,ISD, adequate physical stopping elements, sight and distances VRUs outside(SSD) on the all roadway road orsections about toare enter essential it. Along to withensure the ISD,the adequatesafe spotting stopping of potential sight distances obstacles (SSD )and on allcomfortable road sections vehicle are essential stopping. to ensureThe ma thein safeprinciple spotting ofof intersection potential obstacles design andis to comfortable facilitate the vehicle safe stopping.movements The of main all its principle users. However, of intersection due to design the fa isct to that facilitate vehicles the are safe capable movements of achieving of all its higher users. However,speeds, thus due requiring to the fact greater that vehicles distances are to capable complete of achievinga full stop, higher it is common speeds, to thus use requiringtheir dimensions greater distancesand specifications, to complete in a fullcombination stop, it is common with distinct to use theirhuman dimensions factors and specifications,road features, in to combination obtain the withrequired distinct sight human distances factors that impact and road most features, alignmen tot obtain and profile the required elements sight of new distances designs. that This impact means mostthat, alignmentregularly, the and arrangement profile elements of geometric of new designs. design Thisfeatures means is highly that, regularly, determined the arrangementby car-centered of geometricobtained sight design distances. features isPlus, highly desp determinedite the fact by that car-centered overall visibility obtained is sightprovided distances. during Plus, the despite design thestage, fact urban that overall road environs visibility tend is provided to suffer during changes, the due design to abutting stage, urban property, road environschanges in tend road to assets, suffer changes,vegetation, due and to abutting from the property, ongoing changes increase in (in road dimensions) assets, vegetation, of street and utilities from theas a ongoing consequence increase of (intechnological dimensions) developments of street utilities (digitalization as a consequence of information of technological panels, developments location-based (digitalization information of informationelements, etc.). panels, In addition location-based to this, the information urban road elements, scene also etc.). contains In addition a growing to this, number the urban of electric road sceneand hybrid also contains vehicles a growingwhose engines number tend of electric to be quie andter hybrid and not vehicles as audible whose as engines their combustion tend to be quieterengine andcounterparts,
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