Set max Level of Transit Stress (LTS)
set_max_lts(r5r_core, max_lts)rJava object to connect with R5 routing engine
numeric (between 1 and 4). The maximum level of traffic stress that cyclists will tolerate. A value of 1 means cyclists will only travel through the quietest streets, while a value of 4 indicates cyclists can travel through any road.
No return value, called for side effects.
Other support functions: 
assert_breakdown_stat(),
assert_decay_function(),
assert_points_input(),
check_connection(),
fileurl_from_metadata(),
find_snap(),
posix_to_string(),
select_mode(),
set_max_rides(),
set_max_street_time(),
set_n_threads(),
set_progress(),
set_speed(),
set_suboptimal_minutes(),
set_verbose(),
stop_r5(),
street_network_to_sf(),
transit_network_to_sf()