How to Read Contours on a Topographic Map

In this screencast, Jennifer explains how you can use the contour interval to determine the elevation of different points on a contour map. She also explains how you can determine which direction is up-hill or down-hill by reading contours and using contour lines that cross streams.

[robertbrandywine]

If you don't use a trick like streams, how do you know if the contour line alongside the marked one is higher or lower?