Traffic conflict risk on speed-density curve for data II.

<p>Traffic conflict risk on speed-density curve for data II.</p

Leaf nodes of the tree structure [48].

<p>Leaf nodes of the tree structure [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0182458#pone.0182458.ref048" target="_blank">48</a>].</p

Traffic conflict risk on the speed-flow curve for data I.

<p>Traffic conflict risk on the speed-flow curve for data I.</p

Traffic conflict risk on speed-density curve for data I.

<p>Traffic conflict risk on speed-density curve for data I.</p

Aggregated traffic data in speed-density diagram for data I and II.

<p>Aggregated traffic data in speed-density diagram for data I and II.</p

Comparison of total flow per hour between field and simulated data.

<p>Comparison of total flow per hour between field and simulated data.</p

The relationship between societal risk and crash counts.

<p>The relationship between societal risk and crash counts.</p

Error tests of speeds.

<p>Error tests of speeds.</p

Clustering results of 19 provinces by principal scores.

<p>Clustering results of 19 provinces by principal scores.</p

Scatter plot of the first and second PC's scores.

<p>Scatter plot of the first and second PC's scores.</p