| LOS |
Speed (km/h) |
Adapted from Ministry of Urban Development India (n.d) |
Adapted from Cortes, Gibson, Gschwender, Munizagag & Zuniga, (2011) |
| A |
>30 |
Primarily free flow movement at average travel speeds usually about 70% of the free flow speed for the key corridors |
Excellent |
| B |
<25 to ≤30 |
Small increase in traffic causing substantial increase in approach delay and hence, decrease in arterial speed |
Good |
| C |
<21 to ≤25 |
Fair |
| D |
<19 to ≤21 |
Significant approach delays and average travel speed of 1/3 the free flow speed or lower. Such conditions causing combination of one or more reasons such as high signal density, extensive queuing at critical intersections and inappropriate signal timing |
Barely acceptable |
| E |
<15 to ≤19 |
Key corridors at extremely low speeds below 1/3 to 1/4 of the free flow speed. Intersection congestion is likely at critical signalized locations, with high approach delays. |
Bad |
| F |
≤15 |
Very bad |
