There's no enforceable waiver here.
I believe the driver of the vehicle has some requirements, which may or may not have been met here. Both drivers in this case. While each of you may have a problem if you violated the statute, it shouldn't really matter to liability.
Info edit:
257.618 Accidents; damage to vehicles; stopping required; reporting to police agency or
officer; penalty.
Sec. 618. (1) The driver of a vehicle who knows or who has reason to believe that he has been involved in
an accident upon public or private property that is open to travel by the public shall immediately stop his or
her vehicle at the scene of the accident and shall remain there until the requirements of section 619 are
fulfilled or immediately report the accident to the nearest or most convenient police agency or officer to fulfill
the requirements of section 619(a) and (b) if there is a reasonable and honest belief that remaining at the scene
will result in further harm. The stop shall be made without obstructing traffic more than is necessary.
(2) If an individual violates the requirements of subsection (1) and the accident results in damage to a
vehicle operated by or attended by any individual, the individual is guilty of a misdemeanor punishable by
imprisonment for not more than 90 days or a fine of not more than $100.00, or both.
History: 1949, Act 300, Eff. Sept. 23, 1949;Am. 1958, Act 35, Eff. Sept. 13, 1958;Am. 2005, Act 3, Imd. Eff. Apr. 1, 2005.
and:
257.619 Accidents; duties of driver.
Sec. 619. The driver of a vehicle who knows or who has reason to believe that he or she has been involved
in an accident with an individual or with another vehicle that is operated or attended by another individual
shall do all of the following:
(a) Give his or her name and address, and the registration number of the vehicle he or she is operating,
including the name and address of the owner, to a police officer, the individual struck, or the driver or
occupants of the vehicle with which he or she has collided.
(b) Exhibit his or her operator's or chauffeur's license to a police officer, individual struck, or the driver or
occupants of the vehicle with which he or she has collided.
(c) Render to any individual injured in the accident reasonable assistance in securing medical aid or
arrange for or provide transportation to any injured individual.
History: 1949, Act 300, Eff. Sept. 23, 1949;Am. 1958, Act 35, Eff. Sept. 13, 1958;Am. 1999, Act 73, Eff. Oct. 1, 1999;Am.
2005, Act 3, Imd. Eff. Apr. 1, 2005.