Increased safety on A4 motorway between Schiphol and Roelofarendsveen

Tuesday 2 August 2016
The number of incidents on the A4 motorway between Schiphol and Roelofarendsveen has decreased significantly in recent years. This is clear from the overview of incidents on IM roads in the period 2010 - 2015 published today by Stichting Incident Management Nederland. The document shows that the number of traffic incidents on the westbound carriageway of the A4 in the direction of The Hague between the driver location signs 10.0 and 24.9 decreased from 173 in 2010 to 66 in 2015. This is a decrease of more than 60%. The number of collisions on the other half of the road also decreased.

Ringvaart of the Haarlemmermeer Polder

The section of the A4 motorway concerned has been reconstructed extensively in recent years. A parallel lane was added between Hoofddorp and Nieuw-Vennep to separate local and transit traffic and the aqueduct under the Ringvaart of the Haarlemmermeer Polder at Roelofarendsveen was widened. Another road project with positive results was the widening of the A2 motorway, where the number of incidents dropped considerably particularly in the vicinity of Utrecht: in 2010, the lane heading towards Amsterdam experienced 74 incidents between driver location signs 60.0 and 65.0, but decreased to 29 in 2015.

The overview published by Stichting Incident Management Nederland shows how many incidents occurred between the years 2010 and 2015 on the roads subject to incident management. These roads are broken down into five-kilometre road sections and roads with separate lanes are awarded a score for each lane. The two tables below show which road sections experienced the highest number of incidents in 2010 and in 2015.

Table 1: Number of incidents per year in ranked order in 2015

2015	Road section	2015	2014	2013	2012	2011	2010	Growth
1	10 Re 10,0 - 14,9	132	132	134	100	82	75	76%
2	20 Re 25,0 - 29,9	123	85	93	114	128	122	1%
3	20 Li 30,0 - 34,9	118	117	111	96	104	106	11%
4	16 Li 20,0 - 24,9	101	123	101	122	109	96	5%
5	2 Li 30,0 - 34,9	96	77	47	65	77	47	104%
6	12 Li 25,0 - 29,9	91	76	84	82	80	43	112%
7	2 Li 110,0 - 114,9	88	79	66	50	34	31	184%
8	16 Li 15,0 - 19,9	86	102	86	115	82	93	(8%)
9	10 Li 20,0 - 24,9	84	87	80	104	100	65	29%
10	16 Re 20,0 - 24,9	84	93	53	78	82	76	11%
11	20 Re 30,0 - 34,9	84	76	79	114	104	92	(9%)
12	4 Re 30,0 - 34,9	76	36	15	29	52	36	111%

The tables show that there are also road sections in which the number of incidents rose significantly. A noticeable increase took place on the A10 at Watergraafsmeer in the direction of Zaandam and on the A2 in Den Bosch at the Empel Junction.

Table 2: Number of incidents per year in ranked order in 2010

2010	Road section	2010	2011	2012	2013	2014	2015	Growth
1	20 Re 25,0 - 29,9	122	128	114	93	85	123	1%
2	20 Li 30,0 - 34,9	106	104	96	111	117	118	11%
3	16 Li 20,0 - 24,9	96	109	122	101	123	101	5%
4	16 Li 15,0 - 19,9	93	82	115	86	102	86	(8%)
5	20 Re 30,0 - 34,9	92	104	114	79	76	84	(9%)
6	1 Li 10,0 - 14,9	79	51	28	45	50	51	(35%)
7	16 Re 20,0 - 24,9	76	82	78	53	93	84	11%
8	10 Re 10,0 - 14,9	75	82	100	134	132	132	76%
9	2 Li 60,0 - 64,9	74	79	53	49	30	29	(61%)
10	4 Re 15,0 - 19,9	72	31	35	17	32	34	(53%)
11	1 Re 10,0 - 14,9	71	56	42	45	62	70	(1%)
12	4 Re 25,0 - 29,9	71	60	30	19	19	22	(69%)