No person shall stop or leave any vehicle standing in any of the following places except temporarily for the purpose of and while actually engaged in loading or unloading or in receiving or discharging passengers and while the vehicle is attended by a licensed operator so that it may promptly be moved in case of an emergency or to avoid obstruction of traffic:
Wis. Stat. § 346.53
The trial court erred in finding a truck driver, who parked on a highway for the purpose of unloading sewage into a manhole, negligent as a matter of law and refusing to submit the question of practicality to the jury. Nelson v. Travelers Insurance Co. 80 Wis. 2d 272, 259 N.W.2d 48 (1977).