TRAF­FIC TERMINOLOGY

The Hamilton Spectator - - LOCAL -

Per­pet­ual pave­ment

A pave­ment de­sign that in­cludes mul­ti­ple lay­ers meant to make the road more re­sis­tant to cracks, fa­tigue and rut­ting and last 50 to 70 years. The Red Hill Val­ley Park­way was one of first to use it in On­tario in 2007.

Stone Mas­tic As­phalt

An as­phalt mix that uses high-qual­ity fine and coarse ag­gre­gates that are mixed to­gether with a higher vol­ume of liq­uid as­phalt (like glue). It is more ex­pen­sive and more re­sis­tant to cracks. Ini­tially, it can have less fric­tion but af­ter a few months of wear that “pol­ishes” the ag­gre­gate, it can have bet­ter fric­tion than other roads. Orig­i­nally cre­ated in Ger­many in the 1960s, it is used on the high­est-vol­ume roads in On­tario.

Su­per­pave mix 12.5 FC2

A stan­dard and less ex­pen­sive as­phalt mix used on high-vol­ume (but not the high­est vol­ume) free­ways in On­tario. Su­per­pave mixes were de­vel­oped in the United States in the 1990s. It uses a denser grade of ag­gre­gates and less as­phalt in mix than SMA. It’s ex­pected to be used when the city “shaves and paves” the top layer of the Red Hill start­ing next year.

Cross­over crash

A col­li­sion where a car trav­els through the cen­tre me­dian and crashes in the op­po­site lanes. Six of the 11 deaths on the Lin­coln Alexan­der Park­way and Red Hill Val­ley Park­way were in cross­over crashes.

Bar­ri­ers

There are not con­tin­u­ous me­dian bar­ri­ers di­vid­ing traf­fic trav­el­ling in op­po­site di­rec­tions along the Lin­coln Alexan­der Park­way and Red Hill Val­ley Park­way. There are some lim­ited bar­ri­ers around struc­tures. Ex­perts say bar­ri­ers typ­i­cally re­duce the sever­ity of crashes, but can ac­tu­ally in­crease the num­ber of crashes.

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