Road Lighting Definition -

Road Lighting Classification

For road lighting the lighting criteria are selected dependant
upon the class of road being lit. The class has a range of
sub-classes, from the strictest to the most relaxed, and these are
chosen dependant upon factors, such as typical speed of users,
typical volumes of traffic flow, difficulty of the navigational task,
etc

Road Lighting Classification ME – 1

This class is intended for users of motorised vehicles on
routes such as Expressway & Highway.

Expressway – Serve long trips and provide higher speed of 110
km/hr.

Highway – Serve long to intermediate trip lengths with high
to medium speed.

Divided highway for through traffic with full control
access and all intersections are grade separated.

Luminance

Lm U0 Ul SR TI
≥ 2.0 cd/m2 ≥ 0.40 ≥ 0.70 ≥ 0.50 ≤ 10%

* KEY 
    Lm – maintained average luminance, Uo – overall uniformity, Ul – longitudinal uniformity
    TI – threshold increment, SR – surround ratio

Road Lighting Classification 

ME – 2

This class is intended for users of motorised vehicles on
routes such as Primary Road.

Primary Road – Serve intermediate trip lengths and medium
traveling speeds.

Major roads network within a state that usually link
up the State Capitals and District Capitals or other
Major Towns.

 

 

Luminance

Lm U0 Ul SR TI
≥ 1.5 cd/m2 ≥ 0.40 ≥ 0.70 ≥ 0.50 ≤ 10%

* KEY 
    Lm – maintained average luminance, Uo – overall uniformity, Ul – longitudinal uniformity
    TI – threshold increment, SR – surround ratio

Road Lighting Classification

ME – 3

This class is intended for users of motorised vehicles on
routes such as Secondary Road.

Secondary Road – Serve intermediate trip lengths with partial
access control.

Divided highway for through traffic with full control
access and all intersections are grade separated.

Luminance

Lm U0 Ul SR TI
≥ 1.0 cd/m2 ≥ 0.40 ≥ 0.70 ≥ 0.50 ≤ 15%

* KEY 
    Lm – maintained average luminance, Uo – overall uniformity, Ul – longitudinal uniformity
    TI – threshold increment, SR – surround ratio

Road Lighting Classification

ME – 4

This class is intended for users of motorised vehicles on
routes such as Rural Area Road (Minor Road).

Minor Road – Non-traffic with a short trip lengths and are usually
with partial or no access control.

 

 

Luminance

Lm U0 Ul SR TI
≥ 0.50 cd/m2 ≥ 0.40 ≥ 0.60 ≥ 0.60 ≤ 15%

* KEY 
    Lm – maintained average luminance, Uo – overall uniformity, Ul – longitudinal uniformity
    TI – threshold increment, SR – surround ratio

Road Lighting Classification

For road lighting the lighting criteria are selected dependant
upon the class of road being lit. The class has a range of
sub-classes, from the strictest to the most relaxed, and these are
chosen dependant upon factors, such as typical speed of users,
typical volumes of traffic flow, difficulty of the navigational task,
etc

Road Lighting Classification ME – 1

This class is intended for users of motorised vehicles on
routes such as Expressway & Highway.

Expressway – Serve long trips and provide higher speed of 110 km/hr.

Highway – Serve long to intermediate trip lengths with high to medium speed.

Divided highway for through traffic with full control
access and all intersections are grade separated.

Luminance

Lm ≥ 2.0 cd/m2
U0 ≥ 0.40
Ul ≥ 0.70
SR ≥ 0.50
TI ≤ 10%

* KEY 
    Lm – maintained average luminance
    Uo – overall uniformity
    Ul – longitudinal uniformity
    TI – threshold increment
    SR – surround ratio

Road Lighting Classification ME – 2

This class is intended for users of motorised vehicles on
routes such as Primary Road.

Primary Road – Serve intermediate trip lengths and medium traveling speeds.

Major roads network within a state that usually link
up the State Capitals and District Capitals or other
Major Towns.

Luminance

Lm ≥ 1.5 cd/m2
U0 ≥ 0.40
Ul ≥ 0.70
SR ≥ 0.50
TI ≤ 10%

* KEY 
    Lm – maintained average luminance
    Uo – overall uniformity
    Ul – longitudinal uniformity
    TI – threshold increment
    SR – surround ratio

Road Lighting Classification ME – 3

This class is intended for users of motorised vehicles on
routes such as Secondary Road.

Secondary Road – Serve intermediate trip lengths with partial access control.

Divided highway for through traffic with full control
access and all intersections are grade separated.

Luminance

Lm ≥ 1.0 cd/m2
U0 ≥ 0.40
Ul ≥ 0.70
SR ≥ 0.50
TI ≤ 15%

* KEY 
    Lm – maintained average luminance
    Uo – overall uniformity
    Ul – longitudinal uniformity
    TI – threshold increment
    SR – surround ratio

Road Lighting Classification ME – 4

This class is intended for users of motorised vehicles on
routes such as Rural Area Road (Minor Road).

Minor Road – Non-traffic with a short trip lengths and are usually with partial or no access control.

Luminance

Lm ≥ 0.75 cd/m2
U0 ≥ 0.40
Ul ≥ 0.60
SR ≥ 0.60
TI ≤ 15%

* KEY 
    Lm – maintained average luminance
    Uo – overall uniformity
    Ul – longitudinal uniformity
    TI – threshold increment
    SR – surround ratio