the present invention will be discussed hereinafter in detail in terms of various exemplary embodiments according to the present invention with reference to the accompanying drawings . in the following detailed description , numerous specific details are set forth in order to provide a thorough understanding of the present invention . it will be obvious , however , to those skilled in the art that the present invention may be practiced without these specific details . in other instances , well - known structures are not shown in detail in order to avoid unnecessary obscuring of the present invention . thus , all of the implementations described below are exemplary implementations provided to enable persons skilled in the art to make or use the embodiments of the disclosure and are not intended to limit the scope of the disclosure , which is defined by the claims . as used herein , the word “ exemplary ” or “ illustrative ” means “ serving as an example , instance , or illustration .” any implementation described herein as “ exemplary ” or “ illustrative ” is not necessarily to be construed as preferred or advantageous over other implementations . moreover , in the present description , the terms “ upper ”, “ lower ”, “ left ”, “ rear ”, “ right ”, “ front ”, “ vertical ”, “ horizontal ”, and derivatives thereof shall relate to the invention as oriented in fig1 . furthermore , there is no intention to be bound by any expressed or implied theory presented in the preceding technical field , background , brief summary or the following detailed description . it is also to be understood that the specific devices and processes illustrated in the attached drawings , and described in the following specification , are simply exemplary embodiments of the inventive concepts defined in the appended claims . hence , specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting , unless the claims expressly state otherwise . referring first to fig1 , there is shown an exploded upper perspective view of traffic barrier 1000 according to an exemplary embodiment of the present invention . as illustrated in fig1 , traffic barrier 1000 generally comprises a molded plastic body 1020 . however , body 1020 of traffic barrier 1000 , in addition to plastic , may comprise any suitable non - corrosive material , such as stainless steel or aluminum . in the preferred embodiment , however , the body of traffic barrier 1000 is comprised of a molded or extruded thermoplastic or thermoset polymer . as further illustrated in fig1 , traffic barrier body 1020 generally comprises a generally trapezoidal cross - sectional shape in directions along the length of an imaginary longitudinal axis 1030 . referring still to fig1 , traffic barrier 1000 comprises a pair of longitudinally opposite ends including a front end surface 100 and a rear end surface 200 . longitudinal axis 1030 defines a length of traffic barrier 1000 between front end surface 100 and rear end surface 200 . front end surface 100 defines a vertically oriented raised rib 110 and a parallel , adjacent , vertically oriented slot 120 . rear end surface 200 defines a vertically oriented raised rib 210 and a parallel , adjacent , vertically oriented slot 220 . raised rib 210 of rear end surface 200 and slot 120 of front end surface 100 of each traffic barrier body 1020 are disposed in imaginary , vertically - oriented plane 1040 that is parallel with longitudinal axis 1030 . likewise , raised rib 110 of front end surface 100 and slot 220 of rear end surface 200 of each traffic barrier body 1020 are disposed in imaginary , vertically - oriented plane 1050 that is parallel with longitudinal axis 1030 and plane 1040 . traffic barrier body 1020 also has a top portion 1060 that defines top surface 300 , a bottom portion 1070 that defines bottom surface 400 , and an at least partially hollow interior . as illustrated in fig1 , the interior of traffic barrier body 1020 is defined by a plurality of , preferably three , vertically - oriented , finable cavities 500 having openings 1080 that are distributed in directions along longitudinal axis 1030 and open to top surface 300 as illustrated in fig1 . referring still to fig1 , cavity openings 1080 are preferably of a regular shape so that each cavity 500 may be enclosed by caps 550 , as shown in fig4 . opening 1080 of each cavity 500 may , for example , be rectangular or square as shown or of any regular geometric shape such a triangle , circle , an octagon , hexagon , etc . referring now to fig2 , there is shown an exploded front end elevation of traffic barrier 1000 according to an exemplary embodiment of the present invention . traffic barrier body 1020 further defines longitudinal slot 410 in bottom surface 400 that extends between front end surface 100 and rear end surface 200 . as further illustrated in fig2 , in the vertical direction slot 410 has a generally tapered shape whereby the lateral width of the top 1090 of slot 410 is smaller than the lateral width at the bottom of slot 410 in directions perpendicular to longitudinal axis 1030 . the purpose of this taper is to allow a user of the present invention to stack a plurality of traffic bodies 1020 on top of one another such that the top portion 1060 of a first traffic barrier body 1020 may be received and nest within a corresponding slot 410 of a second , vertically adjacent traffic barrier body 1020 . referring again to fig2 , traffic barrier body 1020 has opposing right and left lateral sides 600 and 700 . in longitudinal cross - section , upper portions 602 and 702 of right and left lateral sides 600 and 700 , respectively , each have a generally arcuate shape . each lateral side upper portion 602 , 702 slopes laterally outward from its juncture with top surface 300 of traffic barrier body 1020 , to its respective juncture with a corresponding lateral side lower portion 604 , 704 , which defines a vertical plane . as illustrated in fig2 , upper portion 602 of right lateral side 600 curves outwardly from its juncture with top surface 300 of traffic barrier body 1020 to its juncture with vertically oriented lower portion 604 , and upper portion 702 of left lateral side 700 curves outwardly from its juncture with top surface 300 of traffic barrier body 1020 to its juncture with vertically oriented lower portion 704 . referring still to fig2 , traffic barrier 1000 according to the present invention may further comprise a barrier base 1001 . barrier base 1001 opposing lateral right and left sides 610 , 710 , respectively , each having a generally flat surface that tapers inwardly from the bottom 1100 of base 1001 to the top 1120 of base 1001 to fit cooperatively into slot 410 in bottom surface 400 of traffic barrier body 1020 . base 1001 is used in situations where a single traffic barrier 1000 is used , or in conjunction with the bottommost traffic barrier body 1020 of a plurality of vertically stacked traffic barriers bodies 1020 , as shown in fig4 . fig2 and 4 also illustrate that longitudinal slot 410 is receivable of the entirety of base 1001 . as shown in fig2 , base 1001 defines front end surface 101 having a vertically oriented raised rib 111 and adjacent slot 121 having the same lateral and longitudinal dimensions as corresponding raised rib 110 and slot 120 provided on the front end surface 100 of traffic barrier body 1020 . barrier base 1001 further defines rear end surface 201 having a vertically oriented raised rib 211 and adjacent slot 221 having the same lateral and longitudinal dimensions as corresponding raised rib 210 and slot 220 provided on the rear end surface 200 of traffic barrier body 1020 . referring now to fig3 , there is shown an exploded side elevation of traffic barrier 1000 according to an exemplary embodiment of the present invention . as illustrated in fig3 , barrier base 1001 is sized and shaped to cooperatively fit within slot 410 of traffic bather body 1020 . fig4 shows an upper perspective view of a traffic barrier 1000 including a pair of vertically stacked traffic bather bodies 1020 where the lowermost traffic barrier body 1020 has a barrier base 1001 disposed into its slot 410 . as further illustrated in fig4 , the openings 1080 of cavities 500 ( see fig1 ) of the uppermost traffic barrier body 1020 are closed by caps 550 . caps 550 are preferably comprised of the same material as each traffic barrier body 1020 . turning now to fig5 , there is shown a plurality of pairs of vertically stacked traffic barrier bodies 1020 . as shown in fig5 , the flat lateral side lower portions 604 and 704 of the traffic barrier bodies 1020 allow for the convenient , close packing of multiple stacks thereof . fig6 shows an alternative packing arrangement of traffic barrier bodies 1020 adapted to fit in a smaller cargo unit for shipping via land , rail , or sea . it will be appreciated by users of the present invention that the design disclosed and claimed herein allows for many more traffic barriers 1000 to be packaged into standard shipping containers for rail , sea , and land transportation thereof than do prior art traffic barriers . while this invention has been described with respect to at least one embodiment , the present invention can be further modified within the spirit and scope of this disclosure . this application is therefore intended to cover any variations , uses , or adaptations of the invention using its general principles . further , this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains and which fall within the limits of the appended claims .