A child safety harness (100;150) for use in conjunction with a three-point adult seatbelt that has a diagonally extending chest section and a horizontally extending lap section, the harness (100;150) comprising: - a first coupling arrangement (116;160) at the rear of the harness (100;150) for removably coupling the harness (100;150) to a diagonally extending chest section of an adult seatbelt, said first coupling arrangement (116;160) comprising: - a first pair of spaced-apart elongate members that extend diagonally towards one another along a first direction, and wherein in use a chest section of an adult seatbelt that extends diagonally along a second direction that is crosswise to the first direction is able to be inserted through the space between the first pair and is then retained by hooking onto the first pair; and - a second pair of spaced-apart elongate members that extend diagonally towards one another along the second direction, wherein in use a chest section of an adult seatbelt that extends diagonally along the first direction is able to be inserted through the space between the second pair and is then retained by hooking onto the second pair; and - a second coupling arrangement (126;170) at the rear of the harness (100;150) for removably coupling the harness (100;150) to a horizontally extending lap section of an adult seatbelt; characterised in that said first coupling arrangement (116;160) comprises: - a tab between each pair of adjacent elongate members. - a first coupling arrangement (116;160) at the rear of the harness (100;150) for removably coupling the harness (100;150) to a diagonally extending chest section of an adult seatbelt, said first coupling arrangement (116;160) comprising: - a first pair of spaced-apart elongate members that extend diagonally towards one another along a first direction, and wherein in use a chest section of an adult seatbelt that extends diagonally along a second direction that is crosswise to the first direction is able to be inserted through the space between the first pair and is then retained by hooking onto the first pair; and - a second pair of spaced-apart elongate members that extend diagonally towards one another along the second direction, wherein in use a chest section of an adult seatbelt that extends diagonally along the first direction is able to be inserted through the space between the second pair and is then retained by hooking onto the second pair; and - a first pair of spaced-apart elongate members that extend diagonally towards one another along a first direction, and wherein in use a chest section of an adult seatbelt that extends diagonally along a second direction that is crosswise to the first direction is able to be inserted through the space between the first pair and is then retained by hooking onto the first pair; and - a second pair of spaced-apart elongate members that extend diagonally towards one another along the second direction, wherein in use a chest section of an adult seatbelt that extends diagonally along the first direction is able to be inserted through the space between the second pair and is then retained by hooking onto the second pair; and - a second coupling arrangement (126;170) at the rear of the harness (100;150) for removably coupling the harness (100;150) to a horizontally extending lap section of an adult seatbelt; - a tab between each pair of adjacent elongate members.