For each record (about 5,500 in total and each represents about 1km of the network) the sinuosity is calculated. It is a ratio of the actual length over the shortest path defined by the start and end nodes of the 1 km section. Section with a Sinuosity value of below 1.008 are considered straight and have a low driver demand. Sinuosity values greater than 1.031 are considered high demand roads. It has been put forward by Smith et al. (2006, 22nd ARRB conference proceedings) that drivers experience concentration difficulties on lower demand roads rather than high demand roads.

In addition Sinuosity has been shown to be a good proxy for horizontal road bendiness. Road Bendiness is an essential imput into establishing Alignment Constraint when calculating Design Speeds.

Data Resources (2)

KML
Sinuosity 1Km Sites (KMZ/KML)
SHP / ZIP
Sinuosity 1Km Sites - Ziped Shapfile

Data Resource Preview - Sinuosity 1Km Sites - Ziped Shapfile

Contact Person Email opendata@tii.ie
Theme Transport
Date dataset released 2016-03-04
Date dataset updated 2016-03-04
Language English
Landing Page http://data.tii.ie/#roadsafety
Geographic coverage National
Period of time covered (begin) 2016-03-04
OR: specify what period of time the dataset covers Dataset updated as National Road Network changes