Table 2.

Traffic statistics by buffer and quintile.

Exposure	$n$	Mean	Median	IQR	Minimum	Maximum
Traffic volumes of nearest road ($\text{vh}/24\text{h}$)
$100-\mathrm{m}$ buffer
Q1	3,866	2,077	2,082	1,210–2,830	32	3,900
Q2	3,815	6,087	5,960	4,940–7,290	3,906	8,680
Q3	3,865	12,242	12,000	10,245–14,100	8,686	16,500
Q4	3,815	21,283	21,314	18,700–23,650	16,521	26,500
Q5	3,830	54,292	35,056	30,000–45,000	26,508	382,000
All	19,191	19,160	12,000	4,940–23,600	32	382,000
$200-\mathrm{m}$ buffer
Q1	5,621	2,110	2,110	1,210–2,910	32	3,950
Q2	5,573	6,212	6,060	5,000–7,410	3,956	8,930
Q3	5,622	12,595	12,475	10,500–14,450	8,938	16,827
Q4	5,580	21,971	22,000	19,400–24,473	16,840	27,700
Q5	5,573	60,158	36,929	30,795–48,200	27,725	382,000
All	27,969	20,563	12,400	5,000–24,400	32	382,000
$300-\mathrm{m}$ buffer
Q1	6,212	2,119	2,130	1,210–2,920	32	3,960
Q2	6,246	6,249	6,100	5,000–7,500	3,961	9,000
Q3	6,246	12,785	12,646	10,700–14,700	9,010	17,000
Q4	6,157	22,227	22,285	19,700–24,700	17,004	27,879
Q5	6,201	61,321	37,208	31,000–49,275	27,887	382,000
All	31,062	20,898	12,600	5,000–24,700	32	382,000
$400-\mathrm{m}$ buffer
Q1	6,523	2,134	2,130	1,210–2,990	32	4,000
Q2	6,434	6,283	6,126	5,000–7,500	4,001	9,030
Q3	6,486	12,799	12,673	10,702–14,700	9,035	17,000
Q4	6,457	22,272	22,300	19,700–14,800	17,004	27,900
Q5	6,463	61,578	37,300	31,246–49,700	27,903	382,000
All	32,363	20,985	12,610	5,000–24,800	32	382,000
Traffic volumes of highest-trafficked road ($\text{vh}/24\text{h}$)
$100-\mathrm{m}$ buffer
Q1	3,912	2,682	2,600	1,481–3,860	32	5,000
Q2	3,821	8,080	7,960	6,470–9,610	5,020	11,500
Q3	3,856	15,748	15,700	13,600–17,700	11,530	20,300
Q4	3,951	25,099	24,789	22,600–27,740	20,301	30,300
Q5	3,758	74,191	41,853	35,000–61,000	30,358	382,000
All	19,298	24,876	15,700	6,390–27,500	32	382,000
$200-\mathrm{m}$ buffer
Q1	5,684	3,956	3,958	2,290–5,600	32	7,500
Q2	5,701	11,842	11,900	9,500–14,089	7,503	16,500
Q3	5,642	20,969	21,100	18,800–23,300	16,504	25,200
Q4	5,643	30,623	30,000	27,725–33,400	25,231	37,800
Q5	5,651	106,348	54,600	42,500–164,000	37,839	382,000
All	28,321	34,677	21,000	9,480–33,300	32	382,000
$300-\mathrm{m}$ buffer
Q1	6,286	5,633	5,500	3,260–8,000	32	10,809
Q2	6,322	16,253	16,400	13,666–18,841	10,810	21,300
Q3	6,332	25,612	25,600	23,450–27,700	21,303	29,865
Q4	6,260	35,908	35,540	32,356–39,400	29,892	44,004
Q5	6,308	138,578	124,000	52,718–210,000	44,012	382,000
All	31,508	44,410	25,600	13,700–39,400	32	382,000
$400-\mathrm{m}$ buffer
Q1	6,566	7,929	7,890	4,530–11,690	59	14,600
Q2	6,607	20,247	20,499	17,600–22,806	14,623	25,000
Q3	6,639	29,249	29,120	27,142–31,269	25,009	34,000
Q4	6,514	41,116	40,333	37,208–45,300	34,022	52,000
Q5	6,549	168,797	165,000	100,000–229,000	52,200	382,000
All	32,875	53,332	29,000	17,600–45,000	32	382,000
Traffic density ($\text{vh}·\mathrm{km/h}$)
$100-\mathrm{m}$ buffer
Q1	3,861	15.3	14.8	8.33–14.8	0.008	30.6
Q2	3,860	51.1	49.8	39.6–62.7	30.6	74.8
Q3	3,878	107	106	88.8–125	74.8	146
Q4	3,852	204	200	172–230	146	276
Q5	3,847	704	419	333–633	277	8,998
All	19,298	216	106	39.6–230	0.008	8,998
$200-\mathrm{m}$ buffer
Q1	5,656	51.4	50.6	26.5–75.4	0.004	104
Q2	5,675	175	173	138–211	104	256
Q3	5,689	361	356	305–413	256	477
Q4	5,659	657	646	553–749	477	905
Q5	5,642	2,594	1,496	1,109–3,335	905	22,020
All	28,321	766	356	138–746	0.004	22,020
$300-\mathrm{m}$ buffer
Q1	6,266	126	123	61.5–190	0.17	262
Q2	6,316	425	423	335–507	262	610
Q3	6,328	829	819	711–947	610	1,087
Q4	6,318	1,453	1,416	1,241–1,650	1,087	1,964
Q5	6,280	5,532	3,939	2,533–7,614	1,964	34,642
All	31,508	1,671	820	337–1,647	0.17	34,642
$400-\mathrm{m}$ buffer
Q1	6,547	266	263	127–402	0.09	542
Q2	6,578	837	827	687–988	542	1,159
Q3	6,590	1,533	1,522	1,334–1,729	1,160	1,954
Q4	6,581	2,649	2,547	2,233–3,008	1,955	3,759
Q5	6,579	9,590	8,226	5,098–12,449	3,760	48,305
All	32,875	2,977	1,525	690–3,009	0.09	48,305

Note: IQR, interquartile range; Q1–Q5, quintiles 1 through 5, where Q5 is the highest quintile of traffic exposure; vh, vehicle.