reduce memory usage in parking_location_choice #292

Job	Run time
linux-64-py3.10	6m 13s
estimation_mode_test	16m 15s
macOS	19m 32s
prototype_mtc	48m 21s
develop-docbuild	0s
win-64	12m 26s
prototype_arc	54m 26s
prototype_mtc	50m 30s
placeholder_psrc	41m 3s
prototype_psrc_in_development	17m 44s
random_seed_generation_test	2m 18s
prototype_marin	1m 23s
prototype_mtc_extended	2h 56m 16s
placeholder_sandag	2h 22m 15s
prototype_sandag_xborder	5m 17s
production_semcog	5m 22s
prototype_mwcog	48m 46s
placeholder_multiple_zone	7m 46s
	10h 55m 53s

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