Who are HA who own the QE2 Dartford Crossing with the Govermment?

The HA, or Highways Agency, is a government agency responsible for operating, maintaining, and improving the motorways and major roads in England. The QE2 Dartford Crossing, which comprises the Dartford Tunnel and the Queen Elizabeth II Bridge, is owned by the government but managed by National Highways, which succeeded the Highways Agency in 2015. The crossing is a critical transport link across the River Thames, facilitating road traffic between Kent and Essex.