Motorway

Lane

Model

r²

M25

1 & 2

PCE = 0.00009Speed² − 0.0162Speed + 2.0

0.97

3

PCE = 0.0001Speed² − 0.016Speed + 1.835

0.96

M42

1

PCE = 0.00009Speed² − 0.0162Speed + 1.992

0.96

2

PCE = 0.00006Speed² − 0.0118Speed + 1.783

0.975