A roof panel arrangement for a vehicle, comprising: - a slider attached to a roof panel, the slider is slidably attached to a rail profile for opening a roof window by sliding the roof panel along a longitudinal axis of the vehicle, - an inertia pawl rotatably attached to the slider at a rotation axis generally perpendicular to an axis parallel with the longitudinal axis of the rail profile, the inertia pawl comprises a main body and an engaging portion arranged on opposite sides of the rotation axis, wherein the rotation of the inertial pawl about the rotation axis is spring loaded with a neutral position with the engaging portion closer to the rail profile than the main body, the engaging portion is separated from the rail profile in the neutral position, wherein the inertia of the main body and the spring properties of the spring are such that, when under the influence of an acceleration in a first direction exceeding a first threshold acceleration, the inertia pawl rotates away from the neutral position in a first rotational direction such that the engaging portion rotates into a first intercepting position for causing a braking force for at least partly preventing a sliding motion of the slider in a first sliding direction, characterized in that the inertia of the main body and the spring properties of the spring are such that, when under the influence of an acceleration in a second direction exceeding a second threshold acceleration, the inertia pawl rotates away from the neutral position in a second rotational direction opposite the first rotational direction such that the engaging portion rotates into a second intercepting position for causing a braking force for at least partly preventing a sliding motion of the slider in a second sliding direction. - a slider attached to a roof panel, the slider is slidably attached to a rail profile for opening a roof window by sliding the roof panel along a longitudinal axis of the vehicle, - an inertia pawl rotatably attached to the slider at a rotation axis generally perpendicular to an axis parallel with the longitudinal axis of the rail profile, the inertia pawl comprises a main body and an engaging portion arranged on opposite sides of the rotation axis, wherein the rotation of the inertial pawl about the rotation axis is spring loaded with a neutral position with the engaging portion closer to the rail profile than the main body, the engaging portion is separated from the rail profile in the neutral position, wherein the inertia of the main body and the spring properties of the spring are such that, when under the influence of an acceleration in a first direction exceeding a first threshold acceleration, the inertia pawl rotates away from the neutral position in a first rotational direction such that the engaging portion rotates into a first intercepting position for causing a braking force for at least partly preventing a sliding motion of the slider in a first sliding direction, characterized in that the inertia of the main body and the spring properties of the spring are such that, when under the influence of an acceleration in a second direction exceeding a second threshold acceleration, the inertia pawl rotates away from the neutral position in a second rotational direction opposite the first rotational direction such that the engaging portion rotates into a second intercepting position for causing a braking force for at least partly preventing a sliding motion of the slider in a second sliding direction. wherein the rotation of the inertial pawl about the rotation axis is spring loaded with a neutral position with the engaging portion closer to the rail profile than the main body, the engaging portion is separated from the rail profile in the neutral position, wherein the inertia of the main body and the spring properties of the spring are such that, when under the influence of an acceleration in a first direction exceeding a first threshold acceleration, the inertia pawl rotates away from the neutral position in a first rotational direction such that the engaging portion rotates into a first intercepting position for causing a braking force for at least partly preventing a sliding motion of the slider in a first sliding direction, characterized in that the inertia of the main body and the spring properties of the spring are such that, when under the influence of an acceleration in a second direction exceeding a second threshold acceleration, the inertia pawl rotates away from the neutral position in a second rotational direction opposite the first rotational direction such that the engaging portion rotates into a second intercepting position for causing a braking force for at least partly preventing a sliding motion of the slider in a second sliding direction.