BUS companies are being urged to put more buses on the cross-harbour routes to maintain schedules despite traffic congestion delays. Chairman of the Transport Advisory Committee, Dr Raymond Ho Chung Tai, was discussing new figures on transport complaints, where almost all public transport showed improvement except the cross-harbour bus service. Complaints were mainly about buses not arriving on time. Bus companies blamed the delays on traffic congestion. Dr Ho admitted congestion was a problem, but said commuters had also complained about vehicle breakdowns causing delays. 'The bus companies should have spare buses ready for breakdowns or delays and keep up maintenance work,' he said. Dr Ho admitted traffic growth needed to be tackled urgently. The number of complaints received by the committee's Transport Complaints Unit for the first three months of this year dropped by 17.7 per cent to 3,002. A total of 64 per cent of the complaints were related to public transport, 16 per cent to road traffic conditions and the rest with traffic control. Dr Ho said the improvement was largely due to a drop in complaints about taxis after the introduction of driver identity plates.