Streets  Power to alter layout, etc., of streets  10. —(1) The Authority may alter the layout of, and carry out other ancillary works in, any street  specified in column (1) of Schedule 2 (streets subject to alteration of layout) in the manner  specified in relation to that street in column (2) of that Schedule.  (2) Without limitation on the scope of the specific powers conferred by article 7 (power to  construct and maintain works) or paragraph (1) but subject to paragraph (3), the Authority may,  for the purpose of constructing, maintaining or using the authorised street tramway, alter the  layout of any street along which the tramway is or is to be laid and the layout of any street having  a junction with such a street; and, without limitation on the scope of that power, the Authority  may—  (a) increase or reduce the width of the whole or part of any carriageway, kerb, footway, cycle  track or verge within the street;  (b) alter the level of the whole or part of any such carriageway, kerb, footway, cycle track or  verge;  (c) replace or alter the surface or surface treatment of the street;  (d) reduce the width of the carriageway of the street by forming a reserved area in the street  as a stopping place for tramcars or by carrying out other works for that purpose;  (e) carry out works for the provision or alteration of parking places, loading bays, bus stop  clearways, cycle tracks and bus laybys;  (f) carry out traffic calming works which are of a description prescribed in the Highways  (Traffic Calming) Regulations 1999( a ) and which are carried out in compliance with  those Regulations;  (g) carry out works to the street for the purpose of deterring or preventing vehicles other than  tramcars from passing along the authorised tramway; and  (h) make and maintain crossovers, sidings or passing places.  (3) The powers conferred by paragraph (2) must not be exercised without the consent of the  street authority, but such consent must not be unreasonably withheld.  Power to keep apparatus in streets  11. —(1) The Authority may, for the purposes of or in connection with the construction,  maintenance and use of the authorised street tramway, place and maintain in any street in which  the tramway is or is to be laid or in any other street any work, equipment or apparatus including,  without limitation on the scope of that power, foundations, platforms, road islands, substations,  electric lines and any electrical or other apparatus.  (2) The powers conferred by this article must not be exercised within the boundaries of a street  outside of the Order limits and the limits of deviation without the consent of the street authority,  but such consent must not be unreasonably withheld.  (3) In this article—  (a) “apparatus” has the same meaning as in Part 3 (street works in England and Wales) of the  1991 Act; and  (b) the reference to any work, equipment, apparatus or other thing in a street includes a  reference to any work, equipment, apparatus or other thing under, over, along or upon the  street.  ( a ) S.I. 1999/1026 was amended by S.I. 2000/1511.  12