Прежний учет на трассе «Магистральная» велся от пересечения с дорогой Р-21 «Кола» со 148-го км до 273-го км на пересечении с трассой А-181 «Скандинавия». До передачи дороги из региональной собственности в федеральную её километраж являлся продолжением трассы А-120 «Санкт-Петербургское южное полукольцо».
http://dorinfo.ru/star_detail.php?ELEMENT_ID=78482
[map]60.292,29.81183 60.29336,29.82247 60.29387,29.82462 60.30055,29.84101 60.30272,29.84633 60.3351,29.88796 60.37009,29.93156 60.37198,29.93543 60.37505,29.94212 60.37628,29.94452 60.37751,29.9489 60.37828,29.95603 60.38006,29.97757 60.38019,29.98083 60.37998,29.98375 60.37942,29.98701 60.37836,29.99113 60.37281,30.01396 60.37289,30.04417 60.37399,30.0495 60.37628,30.05499 60.37841,30.05928 60.38027,30.06563 60.37773,30.14168 60.38019,30.17532 60.38019,30.17979 60.37645,30.20227 60.37628,30.20794 60.38171,30.24073 60.38171,30.24485 60.37578,30.256 60.37467,30.25944 60.37399,30.26648 60.37289,30.27145 60.36865,30.27763 60.36296,30.29377 60.36287,30.29737 60.36525,30.30579 60.36669,30.31368 60.36712,30.32158 60.36771,30.32497 60.3686,30.32703 60.36926,30.32849 60.36962,30.33051 60.37005,30.33437 60.37054,30.33578 60.37138,30.33724 60.3724,30.34531 60.37241,30.34606 60.37236,30.34648 60.37225,30.3468 60.37207,30.34726 60.37146,30.34863 60.37098,30.34965 60.36991,30.35144 60.36876,30.35286 60.36711,30.35426 60.36275,30.3575 60.36145,30.35857 60.36096,30.35913 60.3602,30.36037 60.35959,30.36194 60.35886,30.36439 60.35534,30.37703 60.35465,30.37782 60.35401,30.37837 60.35315,30.37904 60.35073,30.3811 60.34858,30.38355 60.34816,30.38447 60.34732,30.38904 60.34666,30.39157 60.34458,30.39426 60.34322,30.39891 60.3383,30.40632 60.33406,30.41271 60.33312,30.41453 60.33234,30.41646 60.3315,30.41951 60.33103,30.42185 60.32987,30.42915 60.32949,30.43095 60.32714,30.43885 60.3265,30.44168 60.32514,30.45013 60.32501,30.45146 60.32498,30.45284 60.32528,30.45565 60.3256,30.45854 60.32594,30.46071 60.32624,30.4617 60.32663,30.4626 60.32732,30.4638 60.33145,30.47032 60.33319,30.4732 60.33489,30.47668 60.33551,30.47925 60.33587,30.48148 60.33617,30.48234 60.34377,30.49015 60.34402,30.49307 60.34411,30.49539 60.34449,30.49792 60.34479,30.49989 60.34441,30.50268 60.34343,30.50963 60.34211,30.51478 60.34213,30.5186 60.34201,30.51946 60.33978,30.52616 60.33912,30.52736 60.33663,30.53341 60.33438,30.53955 60.33321,30.54345 60.33103,30.54826 60.32967,30.55062 60.32812,30.55233 60.32412,30.55525 60.32356,30.55578 60.32253,30.55689 60.32121,30.55895 60.3203,30.56077 60.31909,30.56415 60.31763,30.56762 60.31697,30.56937 60.31595,30.57293 60.31549,30.57491 60.31338,30.58465 60.30831,30.6074 60.30657,30.61255 60.30544,30.61692 60.30489,30.62053 60.30365,30.64988 60.30085,30.71151 60.29885,30.73863 60.29851,30.74361 60.29851,30.76541 60.29876,30.76738 60.30297,30.78798 60.30408,30.79039 60.30748,30.7933 60.30969,30.79579 60.31216,30.80086 60.31377,30.81047 60.31433,30.81416 60.3144,30.81558 60.3144,30.81631 60.31417,30.8177 60.314,30.81843 60.31257,30.82071 60.30102,30.84 60.2989,30.84215 60.29224,30.84772 60.28488,30.85214 60.27624,30.85695 60.26528,30.86317 60.25293,30.86248 60.25131,30.86253 60.24942,30.86328 60.24804,30.86499 60.24575,30.8683 60.2446,30.86978 60.23431,30.87617 60.23306,30.87746 60.22396,30.89149 60.22251,30.89261 60.2078,30.89398 60.20567,30.89424 60.20422,30.89501 60.19756,30.9042 60.19087,30.9145 60.18912,30.91613 60.18724,30.91733 60.16329,30.92085 60.1615,30.92222 60.13582,30.95844 60.13361,30.96175 60.13253,30.96269 60.13156,30.96299 60.12884,30.96316 60.11532,30.96376 60.11314,30.96286 60.1029,30.95711 60.07876,30.94351 60.07585,30.94256 60.07413,30.94316 60.06206,30.95389 60.06086,30.95707 60.06064,30.96196 60.06124,31.02427 60.06116,31.02702 60.0606,31.02934 60.05931,31.03174 60.05229,31.03466 60.05057,31.03432 60.0474,31.03415 60.04265,31.03586 60.0318,31.03612 60.02936,31.03724 60.01169,31.03535 60.00989,31.03638 59.99959,31.04977 59.99315,31.05183 59.98628,31.04805 59.95002,30.98728 59.94538,30.98419 59.93951,30.9823 59.93119,30.98299 59.92883,30.98119 59.92578,30.97484 59.92513,30.97218 59.92612,30.96488 59.92732,30.96128 59.92494,30.94947 59.91164,30.93222 59.91108,30.93149[/map]
карту изготовил nast