Final answer:
A sign with a bending arrow and a 45km/h indicates a curve ahead with a recommended maximum speed of 45 km/h, which is equivalent to about 28 mph.
Step-by-step explanation:
A sign with a bending arrow and a 45km/h indicates that there is a curve ahead and the recommended maximum speed to navigate the curve safely is 45 kilometers per hour. To understand what this means in terms of speed, we can convert the speed limit from kilometers per hour to miles per hour, knowing that 1 kilometer equals approximately 0.621371 miles. So, a 45 km/h speed limit is roughly equivalent to 28 miles per hour (since 45 x 0.621371 = 27.961695). This is usually the kind of speed you would expect in a residential area or on certain road curves where higher speeds could be dangerous.