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For individual months between April and September 2015:
the average speed on the Strategic Road Network (SRN) ranged from 58.8mph to 60.6mph
the average delay on the SRN in England ranged between 7.9 and 9.4 seconds per vehicle per mile
the reliability of travel times on the SRN in England ranged from 58% to 69% additional time needed on average on individual road sections to ensure on time arrival