Free software for simulation of double-parking impacts on traffic:
https://www.anylogic.com/road-traffic/
"Simulation of Urban MObility" (SUMO) is an open source, highly portable, microscopic road traffic simulation package
Aimsun Live simulates mobility in real time, allowing traffic managers to anticipate congestion on our roads, and stop it before it happens.
MATSim is an open-source framework for implementing large-scale agent-based transport simulations.
TransModeler is a powerful and versatile traffic simulation package applicable to a wide array of traffic planning and modeling tasks.
https://mctrans.ce.ufl.edu/mct/index.php/hcs/
InterSCSimulator – A Smart City Simulator
TRNSYS (pronounced 'tran-sis') is an extremely flexible graphically based software environment used to simulate the behavior of transient systems. TRNSYS can equally well be used to model other dynamic systems such as traffic flow.
It is true that there are several simulators. However, it is worth downloading the basic version first (usually free) to check whether it corresponds to what you are looking for.