How can I extract the OSM XML files of any urban City map?

I am studying UVCAST protocol for vehicular ad hoc networks with infrastructure (RSU).there is RSU Application that will apply on the RSU and UVCAST that will apply on the Vehicles in my code (.cc,.h,.ned ) that wrote according to the studied protocol that they depend on BaseWaveApplLayer #include "veins/modules/application/ieee80211p/BaseWaveApplLayer.h" for RSU Application.h/UVCAST.h and import org.car2x.veins.modules.application.ieee80211p.BaseWaveApplLayer; for RSU Application.ned/UVCAST.ned and also depend on

const simsignalwrap_t RSUApplication::mobilityStateChangedSignal = simsignalwrap_t(MIXIM_SIGNAL_MOBILITY_CHANGE_NAME);

and also there are Beacon messages and Data messages

#include "veins/modules/messages/WaveShortMessage_m.h" #include "veins/base/utils/Coord.h"

in my code. How can I extract the OSM XML files of any urban city with very very large area and the Values of playgroundSizeX ,playgroundSizeY,playgroundSizeZ are large without spending long time on the internet ?.because I want to get many events(accidents,alerts,....) during many TimeEvents: TimeEvent=1800, 2700, 3600, 4500, 5400, 6300 with sim-time-limit = 7290s or TimeEvent=23400, 24300, 25200, 26100, 27000, 27900, 66600, 67500, 68400, 69300, 70200, 71100 with sim-time-limit = 86400s(full day) in omnet.ini

*.rsu[*].appl.startDataProductionTime = ${TimeEvent=1800, 2700, 3600, 4500, 5400, 6300}s

for the first Scenario

*.rsu[*].appl.startDataProductionTime = ${TimeEvent=23400, 24300, 25200, 26100, 27000, 27900, 66600, 67500, 68400, 69300, 70200, 71100}s 

for the second Scenario.If I applied that on medium or small area (the values of playgroundSizeX ,playgroundSizeY,playgroundSizeZ are not large, this means dataROI is not large ), We maybe don't have any events when I execute the Scenario for TimeEvent=6300s for example or another value of TimeEvent ,so I will get the same results for different TimeEvents.

note: I am using GatComSumo.jar with Sumo/bin path, I want to suggest me another application(tool) to extract OSM XML files of my map (.launched,.ned,.rou,.poly,.osm,.sumo.cfg,omnetini,......) without spending long time on the internet to simulate them with the studied protocol.please reply on my question .