Journal of Advanced Transportation

Research Article

Predicting Operating Speeds at Urban Multilane Roundabouts in Abu Dhabi, United Arab Emirates

Table 4

Validation statistics of the speed prediction models.
SiteObserved speedPredicted speedErrorSquared error
Entry Circ. Exit Entry Circ. Exit Entry Circ. Exit Entry Circ. Exit
1
2
3
4
5
6
7
8
9
10
11
12
Sum of errors   
Sum of squared errors   
Mean squared error   
Root-mean squared error