The number of miles travelled on US highways in September has surged since June this year, a strong indicator of economic recovery according to many analysts.

US motorists travelled a total of 387.4 billion kilometres in September, reporting a fourth consecutive monthly rise and the biggest jump since numbers began rising in June, according to the statistics revealed by the Transportation Department.

Every state reported an increase in highway travel in September except Nevada and Pennsylvania.

The number of motorists is tracked by the Transportation Department through more than 4,000 automatic traffic recorders operated by state highway agencies.