Most fatal road accidents occur from 5pm to 10pm on Fridays and Saturdays, the NTSA has said and cited "drunk-driving, drunk-riding and drunk-walking".
Director general Francis Meja said most people travel during weekends and do not observe traffic rules.
"Motorcyclists operate at night without the right gear, including reflective jackets. They are not seen by motorists," he said on Thursday.
Meja said during a breakfast meeting at Nairobi's Panafric Hotel that the accidents also result from poor driving habits and skills, and lower night visibility.
He added that motorists also use unfamiliar routes while attending social functions.
"Pedestrians cross at undesignated areas and easily get knocked down by speeding vehicles," he further said.
The director general said the number of deaths from road crashes
increased from 2,907 in 2014 to 3,057 in 2015 and that their pattern was replicated.
Nairobi recorded the most fatalities last year, Meja said, reporting the number as 668, equivalent to 22 per cent.
"This was due to the increased population and increased road networks and motorisation," he said.
He said Nakuru came second after Nairobi and was followed byNakuru, Kakamega, Machakos and Mombasa counties.
Lamu, Tana River, Turkana and Wajir counties recorded the least number of accidents that resulted in death, he said.
Meja
said the number of fatal road accidents increased by 21 per cent in a period of 10 years, most of the victims - 497 - being pedestrians.
He announced that a new curriculum for driving schools will be rolled out by March 31.