The companies were fined more than £5,000 for infringements on the Transport for London Road Network (TLRN).
They included working without a permit, breach of permitting conditions and failure to correctly notify TfL promptly of works taking place.
BT pleaded guilty to six counts at Westminster Magistrate's Court on 18 January, while Cable & Wireless pleaded guilty to two offences.
BT was prosecuted for infringements at various locations on TfL roads including: Stamford Hill, Marylebone Road, Blackwall Tunnel, Eastern Avenue and Gunnersbury Lane. They were fined a total of £3,765 and ordered to pay TfL's costs of £5,050
Infringements by Cable & Wireless occurred on Lambeth Palace Road and Great Eastern Street. They were fined a total of £1,000 and ordered to pay TfL costs of £2,815
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The court action is the latest in a number of court cases where TfL has prosecuted utility companies for badly managed roadworks.
More than £20,000 has been won in the last 12 months against utility companies for eight separate offences, with TfL recovering around £12,100 in costs from these.
This included £2,000 from National Grid Gas, the highest fine for a utility company by TfL over the last twelve months.
TfL managing director for surface transport Leon Daniels said: “Roadworks offences by any utility company cause significant disruption to all road users, as well as having a knock on effect to local businesses across London.
'Those companies should be aware that we will continue to prosecute where infringements occur; and we will continue to work to further reduce roadworks disruption across London, helping to make journeys for pedestrians, cyclists and road users smoother for all.”
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