The invention provides a method for obtaining traffic road information based on low-precision
GPS data, and the method is used for solving the technical problem in the prior art that the cost is high and the data timeliness is low. The method comprises the following steps of: iterating optimal center separating lines of low-precision
GPS data points on a traffic road whose road information is known; calculating the distance vectors of the low-precision
GPS data point on the road to the optimal center separating lines; iterating an optimal distance vector
confidence interval of the low-precision GPS data points on the road; utilizing a distance vector variance to establish a road width discrete function; and utilizing the optimal distance vector
confidence interval and the road width discrete function to calculated the gradient and width of a traffic road whose road information is unknown. According to the invention, the quasi
Gaussian distribution, symmetric distribution and error characteristics of the low-precision GPS data are utilized, the traffic road information is extracted, the cost is low, the timeliness of information obtaining is high, and the method can be sued for obtaining the high-timeliness traffic road information within a short time period with low cost.