This　work　studies　a　lane　reservation　problem　with　optimally　grouping　tasks,　which　aims　to　design　the　routes　for　some　special　time-guaranteed　transportation　tasks　by　optimal　lane　reservation.　Besides,　the　assignment　of　tasks　to　vehicles　is　optimal　decided　so　as　to　reduce　the　number　of　vehicles　and　save　transportation　cost.　On　the　other　hand,　negative　impact　on　normal　traffic　such　as　increase　of　link　travel　time　on　adjacent　general-purpose　lanes　may　be　caused　by　the　reserved　lanes　because　of　the　exclusive　use　of　them　by　the　special　tasks.　Then,　the　objective　of　the　addressed　problem　is　to　minimize　the　total　impact　caused　by　the　lane　reservation.　The　lane　reservation　problem　with　optimally　grouping　tasks　is　an　extension　of　the　related　problems　studied　in　the　literature.　A　mathematical　programming　model　is　then　formulated　and　solved　via　a　proposed　approach　strategy.　Experiment　results　demonstrates　the　effectiveness　of　the　formulated　model　and　efficiency　of　the　resolution　approach.