CHENNAI: Three months after handing over Mamallapuram-Puducherry section of the East Coast Road (ECR) to the National Highways Authority of India (NHAI) for four-laning work, the Tamil Nadu Road Development Company (TNRDC) on Tuesday suspended toll fee collection at four booths—Anumanthai and Vengambakkam on ECR, and Mamallapuram-Thirukazhukundram road, and Poojeri on Old Mahabalipuram Road or Rajiv Gandhi Salai.