Modular floor for providing support to a vehicle and/or a crowd on an uneven or soft subsurface of a supporting terrain, comprising at least two planks, each plank comprising a length direction (y), a width direction (x), and a height direction (z) which are mutually orthogonal, a top side and a bottom side spaced in the height direction (z), an in essence uniform cross section perpendicular to the length direction (y), a top plate near the top side and a bottom plate near the bottom side, the top and bottom plates extending in the width direction (x) and mutually separated by a plurality of spacing plates in essence parallel to the height direction (z), a first plank of the at least two planks comprising a male connection element connected at an edge of the first plank to the top and bottom plates , the male connection element comprising a hook connection wall extending from the bottom plate to the top plate , the male connection element further comprising a hook comprising a first hook portion extending outwardly at least substantially in the width direction (x) from the hook connection wall to a corner hook portion and a second hook portion extending at least substantially in the height direction (z) from the corner hook portion and towards the top side, a second plank of the at least two planks comprising a female connection element connected at an edge of the second plank to the top and bottom plates , the female connection element comprising a recess formed by a lower recess wall extending outwardly at least substantially in the width direction (x) from the bottom plate to a lower recess wall end, a hind recess wall extending from the bottom plate to the top plate , and an upper recess wall comprising a first recess portion extending outwardly at least substantially in the width direction (x) from the top plate to a corner recess portion and a second recess portion extending at least substantially in the height direction (z) from the corner recess portion and towards the lower recess wall , the recess of the female connection element and the hook of the male connection element configured for loosely interlocking the first and the second plank allowing the modular floor to conform to the contours of said supporting terrain, whether concaved or convexed, wherein the lower recess wall comprises an outer surface comprising a slanted portion extending from a deflection line towards said lower recess wall end and at least partially in the height direction (z) towards said top side, whereby said slanted portion comprises a slant size in the width direction equal to at least 50% of the female connection element size in the width direction, for enabling engagement of said recess of the female connection element of the second plank over the hook of the male connection element of the first plank when the first plank is positioned on said subsurface, characterized in that, said hook connection wall comprises an outer surface in essence parallel to the height direction, said male connection element comprising an upper and a lower filleted connection corner at the attachment of said hook to said outer surface of said hook connection wall, wherein said hook connection wall comprises for each of said upper and lower filleted connection corners an adjacently faced inwardly extending thickening , whereby said thickenings merge in a confluence portion of the hook connection wall comprising a thickness less than each of the maximum thicknesses of said thickenings of the hook connection wall. <EOS>