What is lane distribution factor?

Lane Distribution Factor (LDF) is an integral part of load calculations on urban and rural highways. LDF describes the distribution of vehicular traffic across the roadway. It depends on the traffic composition, speed and volume, origin destination patterns of drivers etc.

How do you find the lane distribution factor?

a] On undivided roads with single lane carriageway the total number of heavy vehicles along both the directions are taken or the lane distribution factor D = 1.0. b] On undivided roads with two lane carriage way, D = 0.75 and the total number of heavy vehicles along both the directions is to considered.

What is the lane distribution factor for a two-lane road?

Dual carriageway roads: For the design of dual two-lane carriageway roads should be based on 75 % of the number of commercial vehicles in each direction. For dual three-lane carriageway and dual four-lane carriageway the distribution factor will be 60 % and 45 % respectively.

What is the meaning of Carriage Way?

A carriageway (British English) or roadway (North American English) consists of a width of road on which a vehicle is not restricted by any physical barriers or separation to move laterally.

How is vehicle damage factor calculated?

Vehicle damage factor based on axle load survey = 2.5 std axle per commercial vehicle. Design CBR of subgrade soil=4%.

What is a road slip?

: a short road that is used to get on or off a major road or highway.

What is carriage width road?

According to Indian Road Congress, the width of carriageway is. (i) 3.75 m for single lane. (ii) 7.0 m for two lanes without raised kerbs. (iii) 7.5 m for two lanes with raised kerbs.

What is mean by vehicle damage factor?

Vehicle Damage Factor The vehicle damage factor (VDF) is a multiplier for converting the number of commercial vehicles of different axle loads and axle configurations to the number of standard axle-load repetitions. It is defined as equivalent number of standard axles per commercial vehicle.

What is vehicle equivalent factor?

Load equivalency factor (abbreviated further as LEF) express the ratio of vehicle number to the number of 100 kN equivalent standard axle. In the analysis load equivalency factors were calculated for each vehicle separately.

What is a running lane?

Filters. A lane , painted on a highway , used to separate runners from normal traffic.

What is a acceleration lane?

Acceleration/deceleration lanes (also known as speed-change lanes or auxiliary lanes) provide drivers with an opportunity to speed up or slow down in a space not used by high-speed through traffic. Dedicated acceleration lanes allow cars that are joining the main road to speed up to match the flow of traffic.

What is load distribution factor (DF)?

• Load distribution factor (DF) is computed and applied to live load bending moments and shear forces. • It is important to note that these factors are applied to wheel loads (multiply by 1/2 if using axle value or lane load).

How many lanes does it take to design traffic?

For these sections, truck traffic will tend to use the inner lanes more often than the two-lane scenario, thus reducing the accumulation of loads on any one lane. The following distribution factors can be used as a multiplier to the one-direction cumulative ESALs to establish the design traffic: 3 lanes 0.7 4 or more lanes 0.6

What is the load distribution factor for Stringer spacing?

– Stringer spacing. • Load distribution factor (DF) is computed and applied to live load bending moments and shear forces. • It is important to note that these factors are applied to wheel loads (multiply by 1/2 if using axle value or lane load).

What happens if three lanes are loaded fit?

If Three Lanes are Loaded fit, to the right. The reaction is computed by summing moments about the hinges independently on the right side and then the left side as shown below. The distribution factor using Lever Rule is taken as the largest of these three cases, which in this example is 1.375.