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Multi-Lane Free Flow (MLFF) tolling system

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April 17, 2026

Prelims: Current events of national and international importance | Infrastructure

Why in News?

The National Highways Authority of India (NHAI) has directed banks issuing FASTags to verify and correct vehicle registration numbers to enable the rollout of the Multi-Lane Free Flow (MLFF) tolling system.

  • It is an advanced facility that allows vehicles to pass through toll gates at high speeds, without stopping or slowing at toll plazas.
  • It will replace traditional physical toll booths.
  • Process - The MLFF or barrier-less tolling system does not have boom barriers.
  • Technology The toll is collected with
    • Satellite-based GPS technology,
    • High-performance Radio Frequency Identification FASTag readers - Detects tags mounted on windshields,
    • Automated Number Plate Recognition (ANPR) cameras - Captures front/back images to recognize license plates (using India-optimized OCR) and
    • Laser/Sensor Technology - Performs automatic vehicle classification (AVC).
  • Mandatory VRN Linkage - In the absence of human intervention in this process, a mismatch in the VRN linked to the FASTag could see commuters pass without paying the fee.
  • Thus, Accurate VRN mapping with FASTag is critical for MLFF tolling.
  • So, the NHAI has directed banks to blacklist FASTags found linked to incorrect or invalid VRNs.
  • Benefits of MLFF
    • Uninterrupted Travel - No slowdowns or physical barriers.
    • Reduced Congestion - High-speed travel increases traffic throughput.
    • Improved Efficiency - Saves fuel and reduces vehicle emissions due to no idling.
    • Enhanced Revenue - Lower risk of leakage and improved compliance.
  • Enforcement actions- Before the MLFF system is made fully operational, NHAI and the Ministry of Road Transport and Highways (MoRTH) are taking a series of steps to prevent misuse, especially concerning the user fee.
  • Issuance of electronic notices to vehicles for non-payment of the user fee.
  • Operationality - The MoRTH has awarded the tender for 16 toll plazas to implement barrierless tolling.
  • The Choryasi fee plaza in Gujarat will be the first barrier-free toll plaza in India.

Reference

The Indian Express | Multi-Lane Free Flow (MLFF) tolling system

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