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IS 11288:1985 is the Indian Standard (BIS) for recommendations for off-road transportation of timber. This standard provides recommendations for the off-road transportation of timber from felling sites to collection points or main roads. It covers the selection of transportation systems, planning of extraction routes like skid trails and forest roads, and the use of various logging equipment. The guidelines aim to ensure efficient and safe timber extraction with minimal environmental impact.
Recommendations for off-road transportation of timber
! The choice of equipment (e.g., skidders vs. forwarders vs. cable systems) is highly dependent on terrain, soil conditions, timber size, and environmental constraints.
! Proper planning of extraction routes (roads, trails) is critical to minimize soil erosion, compaction, and damage to the remaining forest stand.
! Adherence to recommended road gradients and curve radii is essential for vehicle safety, operational efficiency, and minimizing road maintenance costs.
OSHA 29 CFR 1910.266Occupational Safety and Health Administration (OSHA), USA
HighCurrent
Logging operations
Covers safety requirements for all logging operations, including vehicle use, skidding, and yarding.
ISO 11850:2011International Organization for Standardization (ISO), International
MediumCurrent
Machinery for forestry — General safety requirements
Focuses on the safety design of forestry machinery (skidders, forwarders) used in off-road transport.
AS 4047:2006Standards Australia, Australia
MediumCurrent
Rigging in the logging industry
Details requirements for rigging systems used in cable yarding and skidding, a subset of the IS code's scope.
ISO 6814:2009International Organization for Standardization (ISO), International
LowCurrent
Machinery for forestry — Mobile and self-propelled machinery — Terms, definitions and classification
Provides standardized terminology for machinery used in forestry, which is foundational but not operational.
Key Differences
≠The Indian Standard is a 'recommendation', while many international counterparts, like OSHA 1910.266, are mandatory regulations with legal force and penalties for non-compliance.
≠IS 11288:1985 includes guidance on manual and animal-powered skidding methods, reflecting practices of its time, whereas modern standards focus almost exclusively on mechanized operations with skidders, forwarders, and cable yarders.
≠Modern standards like ISO 11850 are highly specific about equipment safety features, mandating performance-tested structures like ROPS (Roll-Over Protective Structures) and FOPS (Falling-Object Protective Structures), whereas the IS code suggests a more general 'strong protective canopy'.
≠International safety standards often have more detailed and quantitative requirements for operational safety, such as specifying minimum separation distances in units of tree lengths, whereas IS 11288 provides more qualitative or generalized guidance.
Key Similarities
≈All standards share the fundamental objective of ensuring the safe, efficient, and environmentally sound movement of timber from the felling site to a landing or roadside.
≈Both the IS code and international standards emphasize the critical importance of selecting the appropriate extraction method based on terrain conditions like slope, soil type, and obstacles.
≈The principle of regular inspection and maintenance of equipment, especially critical components like wire ropes, chains, and braking systems, is a common theme across all related standards.
≈All standards implicitly or explicitly recognize the primary hazards of off-road timber transport, including rolling logs, equipment instability on slopes, and failure of rigging components.
Parameter Comparison
Parameter
IS Value
International
Source
Wire Rope Factor of Safety (Hauling)
At least 2 (Clause 6.3.3)
A design factor of 3 is typical for running/hauling lines.
AS 4047:2006
Protective Structure on Tractors/Skidders
A 'strong protective canopy' should be fitted (Clause 5.2.2).
Must be equipped with performance-tested Roll-Over Protective Structures (ROPS) and Falling-Object Protective Structures (FOPS).
ISO 11850:2011
Maximum Slope for Ground Skidding
Generally suitable for slopes up to about 20° (36%) (Clause 4.2.1).
Machines shall be operated within the slope limitations specified by the manufacturer; often limited to ~40% by best practices.
OSHA 29 CFR 1910.266
Extraction Road Maximum Gradient
Should not exceed 10° (18%), preferably less than 7° (12%) (Clause 8.2).
Maximum sustained grades for low-volume forest roads are typically 10-15%.
US Forest Service Road Design Handbooks
Personnel Safety Distance (Loading)
No person shall stand within 1.5 times the length of the log being handled (Clause 7.2.2).
Work areas must be organized to prevent hazards; a common rule is staying at least two tree lengths away from felling operations.
OSHA 29 CFR 1910.266
Chute Gradient for Timber Sliding
Dry chutes: 15° to 25°; Wet chutes: 8° to 15° (Clause 4.5.2).
Chute systems are largely obsolete and not covered in modern mechanized-focused standards.
N/A
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Maximum Favourable Grade (Loaded Downhill)18 %
Maximum Adverse Grade (Loaded Uphill)10 %
Minimum Curve Radius on Main Forest Roads20 m
Recommended Road Width (Single Lane with turnouts)3.5 m
Maximum Skidding Distance for Tractors500 m
Tables & Referenced Sections
Key Tables
No tables data
Key Clauses
Clause 4 - Classification of Transportation Systems
Clause 5 - Ground Skidding
Clause 6 - Cable Systems
Clause 7 - Forest Roads
Frequently Asked Questions4
What is the primary purpose of IS 11288?+
To provide guidelines for planning and executing the off-road movement of timber using various methods like animal logging, ground skidding, and cable systems.
Does this code specify which type of vehicle to use?+
It provides recommendations on selecting appropriate equipment (like tractors, skidders, forwarders) based on operational factors, but does not mandate a specific make or model.
What is the recommended maximum grade for a logging road when a loaded truck is moving uphill?+
The code suggests a maximum adverse grade of around 10% for efficiency and safety.
Does the code cover road construction?+
It provides recommendations on the planning aspects of forest roads, such as alignment, gradient, and width, but not detailed construction specifications.