SINGAPORE - Motorists who infringe into bus lanes, beware. Video cameras are being installed on all new buses to keep check on the road in front.

The Land Transport Authority (LTA) made the announcement on Thursday, adding that long with the stationing of traffic wardens, CCTV will help to ensure that bus lanes remain clear during operating hours.

To date, more than 3,300 existing buses have been equipped with cameras that continuously monitor the road in front. The system was first tested on 90 buses in 2008.

"Since 2008, we have seen an improvement in motorists' compliance with the bus lane scheme," said the LTA.

Instances of motorists filmed driving in bus lanes during restricted hours has decreased from 2,112 in 2008 to 1,560 in 2013.

The LTA said it is expanding the use of bus lanes and its Mandatory Give Way to Buses scheme to improve bus reliability and cut journey times.

It added that more widespread bus priority measures will also complement an ongoing billion-dollar programme that will put 1,000 additional buses on the road.

By the end of this year, about 300 bus stops islandwide will be covered by the Mandatory Give Way to Buses scheme.

Enforcement efforts have helped bring down the number of violations of the scheme by 40 per cent from 3,325 in 2009 to 1,883 cases last year, the LTA said.

Bus lanes in Singapore currently cover 203km - 23km of full-day lanes and 180km of normal lanes. Full-day bus lanes operate from 7.30am to 8pm on Mondays to Saturdays, while motorists cannot enter normal bus lanes from 7.30am to 9.30am and 5pm to 8pm on weekdays.

Motorists who drive on them during restricted hours face a $130 fine. If it is not paid, the penalty can go up to a $1,000 fine or three months' imprisonment.

The LTA will draw markings on full-day bus lanes at seven locations from June 16 to remind motorists to adhere to the timings.