the really important bit is at the bottom, although the styles and gates thing could be used as a (illegal!) was of closing byways to traffic. legally, they have to allow access unless the byeway is subject to a TRO.
here's the last bit for those who don't manage to work through all the preceding stuff.
(1) Within one year of the passing of this Act, the Secretary of State shall lay
before both Houses of Parliament a report containing an assessment of the
burdens and costs caused by the use of mechanically propelled vehicles on
unsealed rights of way to—
(a) the users of such rights of way,
(b) landowners and tenants, and
(c) other interested parties, including highway authorities, Natural
England, National Park Authorities, local authorities, parish
councils and other community organisations.
(2) A report under subsection (1) shall include—
(a) proposals to alleviate such burdens and costs, and
(b) an assessment as to whether legislation should continue to permit
mechanically propelled vehicles to use unsealed rights of way.
(3) The Secretary of State may through regulations implement any proposals
contained in the report under subsection (1).
(4) Regulations made under subsection (3) shall be made by statutory
instrument.
(5) A statutory instrument under subsection (4) shall not be made unless a
draft has been laid before and approved by both Houses of Parliament.
(6) The Secretary of State shall not issue a report under subsection (1) until he
has consulted with such interested parties as he thinks fit.”