Between 1974 and 1976, the vehicular lanes on the Causeway were widened from 9.1m to 25.3m.
Another three lanes were built and the dual carriageway had three lanes each for those travelling from both sides of the Causeway.
It was expected to handle 40,000 people a day by 1982, as the then Public Works Department (PWD) reported.
It was the biggest construction project on the Causeway after Singapore and Malaysia became two separate nations.
Singapore spent a total of S$9 million widening its side of the Causeway. Malaysia spent approximately S$5 million.
Malaysia started expanding its side of the Causeway first, in July 1973. Works on the Singapore side – which spans approximately 608m of the 1.056km Causeway – started in June 1974.
“They started on the project in July 1973 whereas we started only recently and since then, the price of almost everything has gone up,” said Mr Robert Lim, a PWD engineer in charge of the project, in 1974.
