When Lanes Merge(Traditional Chinese: 情越雙白線) is a TVB modern drama series.

Rushing along the road every day with a vibrant mix of passengers of all kinds, what taxi drivers see and hear is far more varied than one can ever imagine. Retired taxi driver Ho Kaa ( Kent Cheng ) returns to the job after his son Ho Ka-Bo ( Raymond Wong ) is convicted of causing death by drunk driving. The incident has exacerbated the already fractious relationship between the father and the son. Ka-Bo works for Kau after his release from prison. Before long, he has another serious road accident, in which Kau is also involved and severely injured, both mentally and physically. Ka-Bo feels so guilty towards his father and comes to understand the importance of careful driving. He maintains a high degree of vigilance while driving but still gets picked on constantly by female traffic police officer Ko Lai-Sum ( Kate Tsui ). As time goes by, the pair have gradually developed a strong attachment to each other and finally become lovers. But Ka-Bo's ex-girlfriend Cheung Hiu-Man ( Sonija Kwok ) and SUM's grandmother Ko Li Shuk Ching ( Lee Heung Kam ) turn out to be the biggest obstacle to their relationship, leaving the pair stranded in dismay along the tunnel of love.