Recommended (Maintained) Values of Road Lighting Parameters

Category

Surrounds

Luminance level

Uniformity ratios

Glare restriction

Average roads surface luminance

Overall uniformity ration

Lengthwise uniformity ratio

Glare control mark

Threshold increment

Lav (cd/m²)

U0

U1

G

TI (%)

≥

≥

≥

≥

≤

A

Any

2

6

10

B

1

Bright

2

0.7

5

10

2

Dark

1

6

10

C

1

Bright

2

0.4

5

20

2

Dark

1

6

10

D

Bright

2

0.5

4

20

E

1

Bright

1

4

20

2

dark

0.5

5

20