To lay underground electricity lines along the street, the Metropolitan Electricity Authority (MEA) had dug a large hole, big enough to trap a truck. And that's exactly what happened. Police were forced to close part of Ram Intra near Soi 21 after a lorry drove into the hole, forcing motorists onto smaller local roads and allowing only buses to navigate the choked main road.
Incidents involving public works that cause great inconvenience to city residents are hardly new.
For instance, people living in the Makkasan and Pratunam neighbourhoods were caught off-guard on Wednesday when a large volume of water swamped their homes. But it wasn't a feared flood like the one two years before.
A photo of a massive fountain of water bursting out of a broken pipe near the Airport Rail Link station at Makkasan went viral on social media and drew heavy criticism of city authorities. The incident happened during heavy rainfall at 2am as MEA workers laid underground power lines on Ratchaprarop Road.
A backhoe digging up the road accidentally ground into an 80cm water main, releasing a massive amount of water into the local community. Households and shophouses on both sides of the road were flooded with the water reaching 30cm high, while traffic around the area almost ground to a halt.
A barber shop owner said he woke up to find knee-deep water in his house. At first, he thought the flood was caused by the heavy rain during the night. He soon realised that it was caused by a broken water main.
The Metropolitan Waterworks Authority (MWA) struggled to fix the problem and only finished repairing the pipe on Thursday.
During the repairs, the water main which feeds the area had to be closed off and people in the neighbourhood faced a temporary water shortage.
The MWA tried to resolve this problem by sending trucks to supply water to people in the area while its staff pumped water out and helped residents clean their houses.
The Bangkok Metropolitan Administration (BMA) also sent workers in to drain the water into the nearby Makkasan water retention pond.
And so Bangkok faced yet another problem arising from the construction or repair of public utilities on city roads.
Broken water pipes and road subsidence happen frequently and the BMA is well aware of the problems. On Sept 25, a section of a road subsided in front of Wat Leng Noei Yi in Samphanthawong district in Chinatown. The subsidence was fixed quickly. The construction of the Blue Line underground train was blamed for the incident.
On the same day, a section of Rama V in front of Dusit condominium also collapsed after an underground water pipe broke. It was repaired swiftly and the subsidence was not severe.
According to Surapon Anawatchaphongphan, director of the construction and repair office at City Hall's Public Works Department, a scan of Bangkok's roads has found that some have hollow areas underground that need to be fixed urgently. The worst of these include Ramkhamhaeng Road and Nimit Mai Road. The cause is still not known, he said.
Deputy Bangkok governor Amorn Kitchawengkul said a city ordinance regulating building construction stipulates that agencies undertaking projects to construct and repair public utilities must present details to City Hall for examination.
That allows City Hall to work with them to map out plans that ensure public safety, particularly during the rainy season when soil is highly prone to subsidence.
Despite this law, City Hall has never received information from those agencies, Mr Amorn admitted.
City Hall once launched a campaign called "Digging-free roads" in Bangkok to try to prevent problems resulting from roadworks which are part of public utilities development projects - or in other words, projects which lack proper planning.
The campaign was aimed at ensuring Bangkok's busy streets, plagued by traffic congestion, became free of roadworks for 10 years.
Despite putting up signs to raise attention to the campaign, it was a flop as City Hall has no authority to stop those agencies carrying out their public utilities development projects, Mr Amorn said. Consequently, roads continue to be dug up all over the city.
He said City Hall has no law to punish or fine those who cause road subsidence.
All it can do is to send staff to help other agencies to deal with problems, Mr Amorn said.