Singaporeans headed to the polls Friday in the city-state's first contested presidential election in more than a decade, a vote being closely watched as an indication of support for the ruling party after a rare spate of political scandals.

The president's role is largely ceremonial, but there are stringent requirements for the position, which formally oversees the city's accumulated financial reserves and holds the power to veto certain measures and approve anti-graft probes.

While the presidency is a non-partisan post under the constitution, political lines were already drawn ahead of the election to replace incumbent Halimah Yacob, who ran unopposed for her six-year term in 2017.

The city-state's government is run by Prime Minister, Lee Hsien Loong of the People's Action Party (PAP), which has ruled Singapore continuously since 1959.

Observers said the vote could indicate the level of PAP support ahead of general elections due in 2025 or discontent after recent scandals that include a corruption probe into the transport minister and the resignations of two PAP legislators over an affair.

"What we want is a prosperous Singapore," self-employed worker Patrick Low, 70, told reporters after casting his vote.

Long orderly lines were seen by reporters in polling centres where supporters were seen chanting or distributing flyers to lobby for last-minute votes.