Set the editing target to Streets with Speed and Direction and specify the Modify Feature task. Select an improperly oriented street segment and notice that the red node also shows the downstream end of the selected segment. Set the snapping tolerance to 50 feet and the sticky move tolerance to 100 pixels. Editing the Streets with Speed and Direction Layer Open the Editor toolbar by choosing View > Toolbars > Editor, and choose Start Editing from the drop-down to start an editing session. Use the Selection tab in the table of contents to make only the Streets with Speed and Direction layer selectable. Speed Limits Open the attribute table for the Streets with Speed and Direction layer and inspect the new fields (Length_Mi, OneWay, Minutes). Locate all records where SPEED_MPH = 0. Zoom to and inspect each record. Decide whether to increase the speed limit or delete the record. If the choice is increasing the speed limit, use 10, 15, or 20 mph.(Hint: Delete Redlands Mall and Santa Ana Wash; set all other speeds to 10 mph.) Save the map document. Directionality Now to properly orient all freeway and ramp street segments. There are several segments of one-way streets in downtown Redlands that will be validated. 1. Before beginning an editing session, set a sticky move tolerance that will prevent accidentally moving a segment while modifying its orientation. In the Editing toolbar, select the Editing drop-down and open Options. Set the snapping tolerance to 50 feet and the sticky move tolerance to 100 pixels. 2. Close the attribute table for Streets with Speed and Direction and zoom in to the freeway interchange area. Study the segments displaying directional arrows. In the Editor toolbar, set the editing target www.esri.com as the Streets with Speed layer (which is a nonselectable layer) and specify the task as Modify Feature. Select an improperly oriented street segment. Notice that the red node also shows the downstream end of the selected segment. 3. To flip a segment, verify that the nodes are displayed and select the Edit tool (this tool has a black arrowhead icon and is usually located to the right of the Editing toolbar drop-down). 4. Carefully position the mouse cursor near the line's midpoint. (Hint: Look for the small x.) 5. Right-click and select Flip from the context menu. The red leading node swaps ends with the arrow, which indicates the line has reversed direction. Deselect this line. 6. Inspect all freeway and ramp segments and flip all improperly oriented segments. Caution: Be careful not to move any segments. If you think that you might have moved a segment, go to the Editor dropdown and choose Undo Move to return the segment to its original location. 7. Save edits about every 10 flips. (Hint: Use the shortcut keys to navigate the map more rapidly: C to pan, Z to zoom in, and X to zoom out.) 8. Check the Task window on the Editor toolbar to be certain that it displays Modify Feature. It will probably take 20 to 30 minutes to flip all segments. The city streets in Redlands that show directionality are properly oriented. Inspect street segments carefully to ensure this. If you accidentally flip a correct segment, simply flip it back. Check all on-ramps and off-ramps and watch out for a rest area on eastbound I-10. A OneWay code will be assigned to several ramps. Save the edits and the map document. Crossing Relationships In the next process, certain freeway and ramp segments will be merged to build correct crossing relationships. Do not perform this step before all appropriate directional segments are properly oriented. Reopen an edit session and zoom to the I-10/I-210 interchange. Verify that only the Streets with Speed and Direction layer is selectable. Inspect all directional vectors. Use the Select Features tool to individually select several directional vectors. Because all directional vectors share endpoints with other segments, a network built with these segments would maintain correct one-way travel, but might include segments that would make sharp turns from a limitedaccess travel lane onto crossing freeways and even city streets. This is not good. Crossing geometries will help fix this issue. Simply stated, where a limited-access travel lane intersects another class of noncontinuous line segments, the limited-access segments will be merged to create a single crossing element. If two limited-access segments merge into one, which happens with on- and off-ramps, these segments will not be merged. In the interchange area, study these crossing relationships carefully. Using the Continued on page 54 ArcUser