ENV 1317–4

ENV 1317–4 covers requi­re­ments for ener­gy absor­bing ter­mi­nals, how they shall be tested and how their pro­per­ti­es are to be described.

Speed class

The ener­gy absor­bing ter­mi­nals abi­li­ty to stop an errant vehic­le is descri­bed by its per­for­man­ce level.


The stan­dard defi­nes 9 dif­fe­rent tests for ener­gy absor­bing ter­mi­nals. The­se are named TT (Test Ter­mi­nal) follo­wed by a three digit num­ber. The first figu­re tells the appro­ach (1, 2, 4 or 5), the second type of vehic­le (1 – 900 kg car, 2 – 1300 kg car and 3 – 1500 kg car) and the third and last tells the test speed (50, 80, 100 or 110 km/h).


TT 1.2.100: TT (Test Ter­mi­nal), Test 1,vehicle type 2 (car 1300 kg), 100 km/h
TT 1.3.110: TT (Test Ter­mi­nal), Test 1, vehic­le type 3 (car 1500 kg), 110 km/h

Impact seve­ri­ty level

The Impact seve­ri­ty level gives an assess­ment of how safe a ter­mi­nal is for occu­pants in an impacting vehic­le. The­re are two levels, A and B. Impact seve­ri­ty level A is the safest for occu­pants in an impacting vehicle.

Most ener­gy absor­bing ter­mi­nals ful­fil requi­re­ments for impact seve­ri­ty level B. In Swe­den both impact seve­ri­ty lever A and B are accepted.

Class of late­ral displacement

The per­ma­nent late­ral dis­pla­ce­ment of the ener­gy absor­bing ter­mi­nal shall be as shown in the tab­le below.

In Swe­den the class of late­ral dis­pla­ce­ment shall be cho­sen in such a way that a defor­med (impac­ted) ter­mi­nal does not intru­de on adja­cent car­ri­a­ge­ways or covers more than the wid­th of adja­cent pedestrian/bicycle pat­hs minus one meter.


Redirec­tion zone class

The redirec­tion zone class descri­bes how an impacting vehic­le per­forms after col­li­ding with the ener­gy absor­bing terminal.

In Swe­den only redirec­tion zone clas­ses Z1 and Z2 are accep­ted wit­hout a spe­ci­al per­mit from the Swe­dish Trans­port Administration.