Z. The letters I, O, Q, and U are not used. In Minnesota, some county roads are known as county state aid highways. These roads are constructed and maintained by counties, but they are eligible for funding from the County State Aid Highway Fund. Differences in signage between CSAH routes and other county roads depends on the county. Some counties, such as Stearns County, delineate between the two by using the standard blue pentagon marker for CSAH routes and a normal white square marker for other county roads. Most county roads in Minnesota are designated with numbers, although a few non-CSAHs in Dodge County utilize letters. A few roads that cross county borders are also signed with an inter-county designation and a letter. Many counties in Ohio use markers to designate county roads. Ohio's county roads vary widely in construction, signage, and naming from county to county. Seneca County uses the default blue pentagon marker and limited signage (generally only at intersections); Logan County uses a square white marker with a black border (similar to the St. Louis County design in Missouri) and signage is nearly comparable to state route signage, with advance signage of intersections with county roads and termini; and Scioto County uses a marker with a county outline. Canada In Canada, numbered county roads are only found in Ontario, where they are similar to American county highways. Ontario county or regional roads are marked with trapezoid-shaped signs, usually (but not necessarily) with a white, black, green, or blue background, and normally identifying the county or region responsible for the road's maintenance, sometimes with the jurisdiction's coat of arms or corporate logo. The county road network has been present for many years, but has only been signed with the flowerpot logos since the 1970s and early 1980s (depending on the area). Previously, the roads simply had road names, such as "Essex Road 42" or "Kent County Road 14", and so on, but had no markers to designate them. Many Ontario county roads are built to provincial highway standards, as thousands of kilometres of highways were downloaded from the province to counties and regional municipalities in 1997 and 1998, and most of the downloaded highways were rolled into the county road systems. In some situations, these in turn were downloaded from the region/county to the local municipalities. Not all jurisdictions in Ontario which maintain a numbered road system use