A traffic and sound barrier system, comprising: a plurality of wide-flanged vertical posts having a central web and a first flange centered on an end of the web and a second flange centered on an opposite end of the web; the posts configured to be oriented with the first flange facing a roadway when the barrier system is installed at the roadway; a first traffic barrier located between a first and second post; a second traffic barrier located between the second and a third post; each traffic barrier comprising: a front and an opposite back; a first end and an opposite second end; a top and a bottom; a first recess located at the intersection of the back and the first end; a second recess located at the intersection of the back and the second end; the first recess and second recess having a recess front and a recess end; a U-shaped strap having a base and a pair of arms extending perpendicularly away from the base; an orifice located on each arm of the U-shaped strap; the first and second traffic barriers positioned such that the first recess of the first traffic barrier and the second recess of the second traffic barrier are adjacent to the first flange of the second post; a strap fastener connecting one arm of the U-shaped strap to the first recess of the first traffic barrier; a strap fastener connecting the other arm of the U-shaped strap to the second recess of the second traffic barrier; the base of the U-shaped strap surrounding the second flange of the second post to secure the first and second traffic barriers together; a sound barrier panel located on the top of the first traffic barrier; and, the sound barrier extending between the web of the first post and the web of the second post. a plurality of wide-flanged vertical posts having a central web and a first flange centered on an end of the web and a second flange centered on an opposite end of the web; the posts configured to be oriented with the first flange facing a roadway when the barrier system is installed at the roadway; a first traffic barrier located between a first and second post; a second traffic barrier located between the second and a third post; each traffic barrier comprising: a front and an opposite back; a first end and an opposite second end; a top and a bottom; a first recess located at the intersection of the back and the first end; a second recess located at the intersection of the back and the second end; the first recess and second recess having a recess front and a recess end; a front and an opposite back; a first end and an opposite second end; a top and a bottom; a first recess located at the intersection of the back and the first end; a second recess located at the intersection of the back and the second end; the first recess and second recess having a recess front and a recess end; a U-shaped strap having a base and a pair of arms extending perpendicularly away from the base; an orifice located on each arm of the U-shaped strap; the first and second traffic barriers positioned such that the first recess of the first traffic barrier and the second recess of the second traffic barrier are adjacent to the first flange of the second post; a strap fastener connecting one arm of the U-shaped strap to the first recess of the first traffic barrier; a strap fastener connecting the other arm of the U-shaped strap to the second recess of the second traffic barrier; the base of the U-shaped strap surrounding the second flange of the second post to secure the first and second traffic barriers together; a sound barrier panel located on the top of the first traffic barrier; and, the sound barrier extending between the web of the first post and the web of the second post.