Sec. 489(20). Exception to the right of way rules.
(a) The driver of a vehicle entering a public highway from
a private road or driveway shall slow down to five miles an
hour and shall yield the right of way to all vehicles approaching
on such public highway.
(b) The driver of every vehicle upon a highway shall yield
the right of way to police and fire department vehicles when the
latter are operated upon official business and the drivers thereof
sound audible signal by siren or exhaust whistle. This provision
shall not operate to relieve the driver of a police or fire department
vehicle from the duty to drive with due regard for the
safety of all persons using the highway nor shall it protect the
driver of any such vehicle from the consequence of an arbitrary
exercise of such right of way.
