How do you solve for the gig delivery guy on a moped running down the community at full speed and honking instead of taking the parallel streets?
First,
recognize that multi-use paths are protected spaces, not default through-routes for motorized vehicles. The emphasis should always be on prioritizing the most vulnerable users (pedestrians, followed by those on human powered vehicles), through a combination of design, policy, regulation, and enforcement.
Then, once that's understood, to proactively
regulate by vehicle type and infrastructure design, not just rider behavior. That means banning mopeds, motorbikes, and other microvehicles (capable of >20 mph) from multi-use paths, regardless of how fast they’re going, and routing them onto adjacent routes instead.
Finally, once the regulation is in place, we need to
enforce that regulation. This is enforced through signage, infrastructure (bollards, for example), police presence or camera enforcement, and crucially, actual penalties. These penalties could be fines, point deductions on delivery platforms, an impounding vehicles. Learning from other countries with better practices, enforcement doesn't stop at observation: violations are actively documented, offenders are held accountable, and local authorities often work directly with delivery companies to flag repeated offenders, adjust routing algorithms, or even suspend access for noncompliant users.