THE Election Commission has put in place a series of measures to ensure free and peaceful voting across 152 constituencies in West Bengal during the first phase of elections on April 23, including demarcating a 100-metre perimeter around each polling station to regulate entry, a senior official said on Saturday. “The 100-metre perimeter is being marked to maintain order and prevent unauthorised access near polling stations. Only electors will be allowed inside,” the official said. Booth-level officers (BLOs) and other Government staff will remain stationed outside this boundary, where initial verification of voter documents will be carried out, he said. Within the restricted zone, an additional layer of checking will be in place, requiring voter documents to be verified again at two tables before entry into the polling station.