Six-year-old Misbah sits at the back of a motorbike, his thin arms wrapped firmly around his father. Behind Misbah, his brother Omer, 9 , clutches the edges of the seat.
The motorbike roars off and weaves between the heavy morning traffic, cars, vans and lorries belching smoke from their exhausts.
The boysâ€™ father, Ali Osman, 42, drives for 10 kms through the crowded roads of Fitihab in Omdurman, as his children â€“ both without safety helmets - hold on for their lives.
Ali knows that this is not the safest way to take his children to school to school, but he feels he has no choice. He used to pay 140 Sudanese pounds for his sons to take the school bus. But the price of petrol rose from 6 to 12.5 pounds per gallon after the split with South Sudan in July 2011.
The school raised its price for the school bus by 150 pounds a month, while Aliâ€™s petrol bill for his motorbike rose from 72 to 106 pounds a month.
That meant a total monthly increase of 182 pounds. â€śI just canâ€™t afford it,â€ť Ali said.
Aliâ€™s story is a typical of thousands of motorcyclists and other drivers who have suffered from the impact of high petrol prices on their daily lives. On the streets of Khartoum the sight of motorbikes carrying one or two passengers in an attempt to cut transport costs is a common one. Everywhere there are husbands giving their wives a lift to the market or to work, brothers ferrying their sisters to school, university or work, and fathers taking children to school on a scale that has not been seen before the oil stopped flowing from South Sudan.
The problem has affected bikers and motorists in other ways. The fall of the Sudanese pound against the US dollar has pushed up the price of engine oil from 40 to 200 pounds a month and spare parts imported from abroad, they say.
Khamis Koko, 57, a taxi driver, had to buy a tyre for his car last month and it cost him 350 pounds - a huge rise on the 90 pounds he paid last year.
â€śEverything is going up,â€ť he said. â€śI can afford one meal a day for my family and I have had to stop my weekly visits to my relatives."
Other drivers say business has slumped since they were forced to put up their prices because of rising costs. One minivan driver, Salah AbdAllah, 34, said his income has fallen so much that he had been forced to postpone his wedding.â€ťI used to earn 100 pounds a day, but now I make only 70 pounds a day,â€ť he said. â€śI canâ€™t afford to pay for a dowry or even for the wedding."
AbdAllah feels that the only solution could be to leave Sudan and try to find work as a driver in one of the Gulf states.
Some van drivers said they had stopped going out socially except to visit close family. Others said they had even had to give up taking their families out for picnics.
The government announcement that a deal had been reached with South Sudan and that the oil would be flowing again within two weeks has raised hopes that the suffering caused by higher prices may soon be eased.
But similar agreements have been announced before and the two-week deadline has already been put back. Ali hopes the deal will stick this time, but he says he will believe it only when the oil from South Sudan reaches Port Sudan once again.
Written by: Raja Migdad